Cursor-move crash

[thazy]

In window shown, just moving cursor caused crash (terminal record follows; note git pulls and go build):

NOTE: this record also spans when slider1 button got stuck (previous issue report).

hazy@econ1-190-172-dhcp ~/go/src/github.com/goki/gi$ git pull
remote: Counting objects: 33, done.
remote: Compressing objects: 100% (7/7), done.
remote: Total 33 (delta 28), reused 31 (delta 26), pack-reused 0
Unpacking objects: 100% (33/33), done.
From https://github.com/goki/gi
f8f1f5d..f4b4d0a master -> origin/master
Updating f8f1f5d..f4b4d0a
Fast-forward
README.md | 12 +++++--
dialogs.go | 45 ++++++++------------------
font.go | 13 +++-----
giv/argview.go | 175 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
giv/colorview.go | 7 +---
giv/dialogs.go | 104 ++++++++++++++++++++++++++++++++++++++---------------------
giv/filevalueview.go | 72 +++++++++++++++++++++++++++++++++++++++++
giv/fileview.go | 11 ++-----
giv/fontview.go | 61 +++++++++++++++++++++--------------
giv/iconview.go | 71 ++++++++++++++++++++++++----------------
giv/mapview.go | 69 ++++++++++++++++++++-------------------
giv/methview.go | 182 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++------------------------------
giv/prefsview.go | 58 ++++++++++++++-------------------
giv/sliceview.go | 59 ++++++++++++++++++----------------
giv/structview.go | 30 ++++++++---------
giv/tableview.go | 75 +++++++++++++++++++++---------------------
giv/valueview.go | 368 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++----------------------------------------------------------------
prefs.go | 80 ++++++++++++++++++++++++++-------------------
textfield.go | 101 +++++++++++++++++++++++++--------------------------------
widget.go | 14 ++++++--
20 files changed, 1053 insertions(+), 554 deletions(-)
create mode 100644 giv/argview.go
create mode 100644 giv/filevalueview.go
thazy@econ1-190-172-dhcp ~/go/src/github.com/goki/gi$ cd ../ki
thazy@econ1-190-172-dhcp ~/go/src/github.com/goki/ki$ git pull
Already up to date.
thazy@econ1-190-172-dhcp ~/go/src/github.com/goki/ki$
thazy@econ1-190-172-dhcp ~/go/src/github.com/goki/ki$
thazy@econ1-190-172-dhcp ~/go/src/github.com/goki/ki$
thazy@econ1-190-172-dhcp ~/go/src/github.com/goki/ki$ cd ../gi
thazy@econ1-190-172-dhcp ~/go/src/github.com/goki/gi$ cd examples/
thazy@econ1-190-172-dhcp ~/go/src/github.com/goki/gi/examples$ cd widgets/
thazy@econ1-190-172-dhcp ~/go/src/github.com/goki/gi/examples/widgets$ ./widgets
Received button signal: ButtonPressed from button: button1
Received button signal: ButtonReleased from button: button1
Received button signal: ButtonClicked from button: button1
Doing final Quit cleanup here..
Doing final Close cleanup here..
thazy@econ1-190-172-dhcp ~/go/src/github.com/goki/gi/examples/widgets$
thazy@econ1-190-172-dhcp ~/go/src/github.com/goki/gi/examples/widgets$
thazy@econ1-190-172-dhcp ~/go/src/github.com/goki/gi/examples/widgets$
thazy@econ1-190-172-dhcp ~/go/src/github.com/goki/gi/examples/widgets$ go build
thazy@econ1-190-172-dhcp ~/go/src/github.com/goki/gi/examples/widgets$
thazy@econ1-190-172-dhcp ~/go/src/github.com/goki/gi/examples/widgets$
thazy@econ1-190-172-dhcp ~/go/src/github.com/goki/gi/examples/widgets$
thazy@econ1-190-172-dhcp ~/go/src/github.com/goki/gi/examples/widgets$
thazy@econ1-190-172-dhcp ~/go/src/github.com/goki/gi/examples/widgets$ ./widgets
Received button signal: ButtonPressed from button: button1
Received button signal: ButtonReleased from button: button1
Received button signal: ButtonClicked from button: button1
Received slider signal: SliderValueChanged from slider: slider1 with data: 0.5
Received slider signal: SliderPressed from slider: slider1 with data: 0.5
Received slider signal: SliderValueChanged from slider: slider1 with data: 0.6
Received slider signal: SliderValueChanged from slider: slider1 with data: 0.7
Received slider signal: SliderValueChanged from slider: slider1 with data: 0.8
Received slider signal: SliderValueChanged from slider: slider1 with data: 0.90000004
Received slider signal: SliderValueChanged from slider: slider1 with data: 0.8
Received slider signal: SliderValueChanged from slider: slider1 with data: 0.7
Received slider signal: SliderValueChanged from slider: slider1 with data: 0.6
Received slider signal: SliderValueChanged from slider: slider1 with data: 0.5
Received slider signal: SliderReleased from slider: slider1 with data: 0.5
Received slider signal: SliderPressed from slider: slider2 with data: 0.5777234
Received slider signal: SliderReleased from slider: slider2 with data: 0.49612403
Received slider signal: SliderValueChanged from slider: slider2 with data: 0.49612403
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.26797882
Received scrollbar signal: SliderPressed from scrollbar: scrollbar1 with data: 0.26797882
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.26916382
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.27034885
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.27153385
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.27271885
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.27390388
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.27508888
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.27627388
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.2774589
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.2798289
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.28101394
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.288124
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.290494
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.29404902
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.29760405
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.29878905
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.30234408
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.3035291
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.30708414
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.30945414
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.31300917
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.3141942
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.3165642
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.31774923
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.32011923
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.32130426
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.32367426
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.3260443
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.3272293
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.32959932
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.33196935
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.33315435
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.33433935
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.33670938
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.3390794
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.3414494
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.34381944
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.34737447
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.34974447
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.35448453
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.35566953
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.36040956
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.3615946
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.36514962
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.36751962
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.37107465
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.37344468
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.3758147
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.3781847
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.38055474
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.38173974
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.38529477
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.3876648
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.3900348
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.39121982
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.39358982
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.39477485
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.39595985
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.39714485
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.39595985
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.39477485
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.39358982
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.39240482
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.3900348
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.3876648
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.38292477
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.38173974
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.3781847
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.3769997
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.37344468
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.36988965
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.36633462
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.36514962
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.3627796
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.3615946
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.36040956
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.35922456
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.35685453
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.35566953
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.35448453
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.3521145
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.34974447
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.34618944
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.34381944
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.3426344
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.34381944
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.34618944
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.34737447
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.34855947
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.34974447
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.3509295
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.3521145
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.35448453
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.35685453
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.35803956
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.3615946
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.3627796
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.3639646
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.36514962
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.3639646
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.3627796
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.3615946
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.36040956
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.35922456
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.35803956
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.35685453
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.35566953
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.35448453
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.3532995
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.3521145
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.3509295
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.34974447
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.3509295
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.3521145
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar1 with data: 0.3532995
Received scrollbar signal: SliderReleased from scrollbar: scrollbar1 with data: 0.3532995
Received scrollbar signal: SliderPressed from scrollbar: scrollbar2 with data: 0.5241468
Received scrollbar signal: SliderReleased from scrollbar: scrollbar2 with data: 0.4564935
Received scrollbar signal: SliderValueChanged from scrollbar: scrollbar2 with data: 0.4564935
Received slider signal: SliderValueChanged from slider: slider1 with data: 0.5
Received slider signal: SliderPressed from slider: slider1 with data: 0.5
Received slider signal: SliderValueChanged from slider: slider1 with data: 0.6
Received slider signal: SliderValueChanged from slider: slider1 with data: 0.7
Received slider signal: SliderValueChanged from slider: slider1 with data: 0.8
Received slider signal: SliderValueChanged from slider: slider1 with data: 0.7
Received slider signal: SliderValueChanged from slider: slider1 with data: 0.6
Received slider signal: SliderValueChanged from slider: slider1 with data: 0.5
Received slider signal: SliderReleased from slider: slider1 with data: 0.5
Received button signal: ButtonPressed from button: button2
Received button signal: ButtonReleased from button: button2
Received button signal: ButtonClicked from button: button2
Received button signal: ButtonPressed from button: button2
Received button signal: ButtonReleased from button: button2
Received button signal: ButtonClicked from button: button2
Received button signal: ButtonPressed from button: button2
Received button signal: ButtonReleased from button: button2
Received button signal: ButtonClicked from button: button2
Received slider signal: SliderValueChanged from slider: slider1 with data: -0
Received slider signal: SliderPressed from slider: slider1 with data: -0
Received slider signal: SliderReleased from slider: slider1 with data: -0
Received slider signal: SliderValueChanged from slider: slider1 with data: -0
Received slider signal: SliderPressed from slider: slider1 with data: -0
Received slider signal: SliderReleased from slider: slider1 with data: -0
Received slider signal: SliderValueChanged from slider: slider1 with data: -0
Received slider signal: SliderPressed from slider: slider1 with data: -0
Received slider signal: SliderReleased from slider: slider1 with data: -0
Received slider signal: SliderValueChanged from slider: slider1 with data: -0
Received slider signal: SliderPressed from slider: slider1 with data: -0
Received slider signal: SliderReleased from slider: slider1 with data: -0
Received slider signal: SliderValueChanged from slider: slider1 with data: -0
Received slider signal: SliderPressed from slider: slider1 with data: -0
Received slider signal: SliderReleased from slider: slider1 with data: -0
Received slider signal: SliderValueChanged from slider: slider1 with data: -0
Received slider signal: SliderPressed from slider: slider1 with data: -0
Received slider signal: SliderReleased from slider: slider1 with data: -0
Received slider signal: SliderValueChanged from slider: slider1 with data: -0
Received slider signal: SliderPressed from slider: slider1 with data: -0
Received slider signal: SliderReleased from slider: slider1 with data: -0
Received slider signal: SliderValueChanged from slider: slider1 with data: -0
Received slider signal: SliderPressed from slider: slider1 with data: -0
Received slider signal: SliderReleased from slider: slider1 with data: -0
Received slider signal: SliderValueChanged from slider: slider1 with data: -0
Received slider signal: SliderPressed from slider: slider1 with data: -0
Received slider signal: SliderReleased from slider: slider1 with data: -0
Received slider signal: SliderValueChanged from slider: slider1 with data: -0
Received slider signal: SliderPressed from slider: slider1 with data: -0
Received slider signal: SliderReleased from slider: slider1 with data: -0
Received slider signal: SliderValueChanged from slider: slider1 with data: -0
Received slider signal: SliderPressed from slider: slider1 with data: -0
Received slider signal: SliderReleased from slider: slider1 with data: -0
Received slider signal: SliderValueChanged from slider: slider1 with data: -0
Received slider signal: SliderPressed from slider: slider1 with data: -0
Received slider signal: SliderReleased from slider: slider1 with data: -0
Received slider signal: SliderValueChanged from slider: slider1 with data: -0
Received slider signal: SliderPressed from slider: slider1 with data: -0
Received slider signal: SliderReleased from slider: slider1 with data: -0
Received slider signal: SliderValueChanged from slider: slider1 with data: -0
Received slider signal: SliderPressed from slider: slider1 with data: -0
Received slider signal: SliderReleased from slider: slider1 with data: -0
Received slider signal: SliderValueChanged from slider: slider1 with data: -0
Received slider signal: SliderPressed from slider: slider1 with data: -0
Received slider signal: SliderReleased from slider: slider1 with data: -0
Received slider signal: SliderReleased from slider: slider1 with data: -0
Received slider signal: SliderReleased from slider: slider1 with data: -0
Received slider signal: SliderValueChanged from slider: slider1 with data: -0
Received slider signal: SliderPressed from slider: slider1 with data: -0
Received slider signal: SliderReleased from slider: slider1 with data: -0
Received slider signal: SliderValueChanged from slider: slider1 with data: -0
Received slider signal: SliderPressed from slider: slider1 with data: -0
Received slider signal: SliderReleased from slider: slider1 with data: -0
Received slider signal: SliderValueChanged from slider: slider1 with data: -0
Received slider signal: SliderPressed from slider: slider1 with data: -0
Received slider signal: SliderReleased from slider: slider1 with data: -0
Received slider signal: SliderReleased from slider: slider1 with data: -0
Received slider signal: SliderReleased from slider: slider1 with data: -0
Received slider signal: SliderValueChanged from slider: slider1 with data: -0
Received slider signal: SliderPressed from slider: slider1 with data: -0
Received slider signal: SliderReleased from slider: slider1 with data: -0
Received slider signal: SliderReleased from slider: slider1 with data: -0
Received slider signal: SliderReleased from slider: slider1 with data: -0
Received slider signal: SliderValueChanged from slider: slider1 with data: -0
Received slider signal: SliderPressed from slider: slider1 with data: -0
Received slider signal: SliderReleased from slider: slider1 with data: -0
Received slider signal: SliderReleased from slider: slider1 with data: -0
Received slider signal: SliderReleased from slider: slider1 with data: -0
Received slider signal: SliderReleased from slider: slider1 with data: -0
Received slider signal: SliderReleased from slider: slider1 with data: -0
Received slider signal: SliderValueChanged from slider: slider1 with data: -0
Received slider signal: SliderPressed from slider: slider1 with data: -0
Received slider signal: SliderReleased from slider: slider1 with data: -0
Received slider signal: SliderValueChanged from slider: slider1 with data: -0
Received slider signal: SliderPressed from slider: slider1 with data: -0
Received slider signal: SliderReleased from slider: slider1 with data: -0
Received slider signal: SliderReleased from slider: slider1 with data: -0
Received slider signal: SliderReleased from slider: slider1 with data: -0
Received slider signal: SliderValueChanged from slider: slider1 with data: -0
Received slider signal: SliderPressed from slider: slider1 with data: -0
Received slider signal: SliderReleased from slider: slider1 with data: -0
Received slider signal: SliderReleased from slider: slider1 with data: -0
Received slider signal: SliderReleased from slider: slider1 with data: -0
Received slider signal: SliderValueChanged from slider: slider1 with data: -0
Received slider signal: SliderPressed from slider: slider1 with data: -0
Received slider signal: SliderReleased from slider: slider1 with data: -0
Received slider signal: SliderValueChanged from slider: slider1 with data: -0
Received slider signal: SliderPressed from slider: slider1 with data: -0
Received slider signal: SliderReleased from slider: slider1 with data: -0
Received slider signal: SliderValueChanged from slider: slider1 with data: -0
Received slider signal: SliderPressed from slider: slider1 with data: -0
Received slider signal: SliderReleased from slider: slider1 with data: -0
Received slider signal: SliderValueChanged from slider: slider1 with data: -0
Received slider signal: SliderPressed from slider: slider1 with data: -0
Received slider signal: SliderReleased from slider: slider1 with data: -0
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x20 pc=0x42dfbad]

goroutine 217 [running]:
image.(*RGBA).Bounds(...)
/usr/local/Cellar/go/1.10.3/libexec/src/image/image.go:72
github.com/goki/gi.(*Viewport2D).ComputeBBox2D(0xc440339000, 0x0, 0x0, 0x0, 0x0, 0x0, 0xffffffffffffffff)
/Users/thazy/go/src/github.com/goki/gi/viewport2d.go:316 +0x2d
github.com/goki/gi.(*WidgetBase).Move2DBase(0xc440339000, 0x0, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0)
/Users/thazy/go/src/github.com/goki/gi/widget.go:370 +0xf1
github.com/goki/gi.(*Viewport2D).Move2D(0xc440339000, 0x0, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0)
/Users/thazy/go/src/github.com/goki/gi/viewport2d.go:390 +0x6d
github.com/goki/gi.(*Node2DBase).Move2DChildren(0xc439b88480, 0x0, 0xffffffffffffffff)
/Users/thazy/go/src/github.com/goki/gi/node2d.go:558 +0x152
github.com/goki/gi.(*WidgetBase).Move2D(0xc439b88480, 0x0, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0)
/Users/thazy/go/src/github.com/goki/gi/widget.go:375 +0x8f
github.com/goki/gi.(*Node2DBase).Move2DChildren(0xc442a43088, 0x0, 0xffffffffffffffff)
/Users/thazy/go/src/github.com/goki/gi/node2d.go:558 +0x152
github.com/goki/gi.(*Layout).Move2D(0xc442a43088, 0x0, 0xffffffffffffffff, 0x41d, 0x11a, 0xcc5, 0x781)
/Users/thazy/go/src/github.com/goki/gi/layout.go:1619 +0xd3
github.com/goki/gi.(*PartsWidgetBase).Move2D(0xc442a42c80, 0x0, 0xffffffffffffffff, 0x41d, 0x11a, 0xcc5, 0x781)
/Users/thazy/go/src/github.com/goki/gi/widget.go:755 +0xed
github.com/goki/gi.(*Node2DBase).Move2DChildren(0xc429bce000, 0x0, 0xffffffffffffffff)
/Users/thazy/go/src/github.com/goki/gi/node2d.go:558 +0x152
github.com/goki/gi.(*Layout).Move2D(0xc429bce000, 0x0, 0x0, 0x40d, 0xdf, 0xd00, 0x791)
/Users/thazy/go/src/github.com/goki/gi/layout.go:1619 +0xd3
github.com/goki/gi.(*WidgetBase).Move2DTree(0xc429bce000)
/Users/thazy/go/src/github.com/goki/gi/widget.go:391 +0x185
github.com/goki/gi.(*Layout).SetScroll.func1(0x4629220, 0xc429bce000, 0x462af20, 0xc439a26000, 0x0, 0x44c64c0, 0xc42e81e0c8)
/Users/thazy/go/src/github.com/goki/gi/layout.go:1097 +0x8c
github.com/goki/ki.(*Signal).Emit(0xc439a27af8, 0x462af20, 0xc439a26000, 0x0, 0x44c64c0, 0xc42e81e0c8)
/Users/thazy/go/src/github.com/goki/ki/signal.go:157 +0x1b6
github.com/goki/gi.(*SliderBase).SetValueAction(0xc439a26000, 0x3f800000)
/Users/thazy/go/src/github.com/goki/gi/sliders.go:269 +0xd6
github.com/goki/gi.(*Layout).ScrollDelta(0xc429bce000, 0x0, 0x1, 0x462a0a0)
/Users/thazy/go/src/github.com/goki/gi/layout.go:1167 +0xcd
github.com/goki/gi.(*Layout).LayoutScrollEvents.func1(0x4629220, 0xc429bce000, 0x462de40, 0xc42e973100, 0x3, 0x454ea20, 0xc449e1c040)
/Users/thazy/go/src/github.com/goki/gi/layout.go:1488 +0x9b
github.com/goki/gi.(*WinEventRecv).Call(0xc45200bdd0, 0x462de40, 0xc42e973100, 0x3, 0x454ea20, 0xc449e1c040)
/Users/thazy/go/src/github.com/goki/gi/window.go:1081 +0x6d
github.com/goki/gi.(*Window).SendEventSignal(0xc42e973100, 0x4622da0, 0xc449e1c040, 0x2477aa01)
/Users/thazy/go/src/github.com/goki/gi/window.go:1195 +0xc65
github.com/goki/gi.(*Window).EventLoop(0xc42e973100)
/Users/thazy/go/src/github.com/goki/gi/window.go:960 +0xd5a
created by github.com/goki/gi.(*Window).GoStartEventLoop
/Users/thazy/go/src/github.com/goki/gi/window.go:438 +0x3f
thazy@econ1-190-172-dhcp ~/go/src/github.com/goki/gi/examples/widgets$

[rcoreilly]

looks like something is nil that shouldn't be -- I added a guard and reopen if you get a gain. there are also various other things that have been fixed in the interim that might fix this..