Zoom by trackpad does not update until click

[jokohoko]

Version

Version 2.1.0-alpha1+win64 - 201908091120

Operating system type + version

HP Zbook17 laptop with a synaptics smbus touchpad

PrusaSlicer
Version:   2.1.0-alpha1+win64
Build:     PrusaSlicer-2.1.0-alpha1+win64-201908091120

Operating System:    Windows
System Architecture: 64 bit
Windows Version:     Windows 10 (build 17763), 64-bit edition
Total RAM size [MB]: 16,569MB
OpenGL installation
GL version:   4.6.0 NVIDIA 425.51
Vendor:       NVIDIA Corporation
Renderer:     Quadro K3100M/PCIe/SSE2
GLSL version: 4.60 NVIDIA

Behavior

When scroll zooming with the trackpad of my laptop the window does not update until the mouse clicks. This was not the case in the previous release V2.0.0
I only have a single laptop, so I cannot compare on a different one.

If needed i can make a video of the effect, but not without installing new softwares for this.

[ardenpm]

I am reproducing this also with my laptop trackpad. No issue with the mouse wheel, just the trackpad.

[bubnikv]

I am seeing it as well.

@enricoturri1966 would you please look into it? Thanks.

[bubnikv]

Fixed with 4fbee32

For an unknown reason, if the scrolling is performed on Windows
with the two finger gesture on touch pad, there is no Idle event
generated on some computers.
The Idle is not generated on Vojtech's laptop, it is generated
on Enrico's laptop.
evt.Skip() solves the issue on Vojtech's laptop.

Closing.