crash in widget.(*RichText).lineSizeToColumn

[secsys-go]

Checklist

• I have searched the issue tracker for open issues that relate to the same problem, before opening a new one.
• This issue only relates to a single bug. I will open new issues for any other problems.

Describe the bug

We used the Fuzz engine to modify some Test(TestEntry_EraseSelection) data, and then the following crash appeared. Triggered when the value of the exported member (e.CursorColumn) is negative.

How to reproduce

The simplified test code is in Example code

Screenshots

CrashLog

panic: runtime error: slice bounds out of range [:-1] [recovered]
        panic: runtime error: slice bounds out of range [:-1]

goroutine 63 [running]:
testing.tRunner.func1.2({0x87e8c0, 0xc000024138})
        /home/zjx/.local/go/src/testing/testing.go:1211 +0x24e
testing.tRunner.func1()
        /home/zjx/.local/go/src/testing/testing.go:1214 +0x218
panic({0x87e8c0, 0xc000024138})
        /home/zjx/.local/go/src/runtime/panic.go:1038 +0x215
fyne.io/fyne/v2/widget.(*RichText).lineSizeToColumn(0xc0001c0580, 0xffffffffffffffff, 0x60)
        /home/zjx/workspace/gowork/src/purelib/crashConfirm/fyne/widget/richtext.go:253 +0x33a
fyne.io/fyne/v2/widget.(*entryContentRenderer).buildSelection.func1(0x863a80, 0x0)
        /home/zjx/workspace/gowork/src/purelib/crashConfirm/fyne/widget/entry.go:1569 +0x2b
fyne.io/fyne/v2/widget.(*entryContentRenderer).buildSelection(0xc00012c1e0)
        /home/zjx/workspace/gowork/src/purelib/crashConfirm/fyne/widget/entry.go:1619 +0x512
fyne.io/fyne/v2/widget.(*entryContentRenderer).moveCursor(0xc00012c1e0)
        /home/zjx/workspace/gowork/src/purelib/crashConfirm/fyne/widget/entry.go:1665 +0x25
fyne.io/fyne/v2/widget.(*entryContentRenderer).Refresh(0xc00012c1e0)
        /home/zjx/workspace/gowork/src/purelib/crashConfirm/fyne/widget/entry.go:1533 +0x1b4
fyne.io/fyne/v2/widget.(*entryRenderer).Refresh(0xc0000207c0)
        /home/zjx/workspace/gowork/src/purelib/crashConfirm/fyne/widget/entry.go:1407 +0x482
fyne.io/fyne/v2/widget.(*BaseWidget).Refresh(0xc000213de0)
        /home/zjx/workspace/gowork/src/purelib/crashConfirm/fyne/widget/widget.go:138 +0x2e
fyne.io/fyne/v2/widget.(*BaseWidget).setFieldsAndRefresh(0xc00000c1e0, 0xc000213de8)
        /home/zjx/workspace/gowork/src/purelib/crashConfirm/fyne/widget/widget.go:152 +0x71
fyne.io/fyne/v2/widget.(*Entry).updateText(0xc00000c1e0, {0xc000024120, 0x17})
        /home/zjx/workspace/gowork/src/purelib/crashConfirm/fyne/widget/entry.go:1172 +0x7c
fyne.io/fyne/v2/widget.(*Entry).TypedKey(0xc00000c1e0, 0xc00000e390)
        /home/zjx/workspace/gowork/src/purelib/crashConfirm/fyne/widget/entry.go:648 +0x605
fyne.io/fyne/v2/widget.TestEntry_EraseSelection.func1(0x855d00)
        /home/zjx/workspace/gowork/src/purelib/crashConfirm/fyne/widget/entry_internal_test.go:242 +0x99
fyne.io/fyne/v2/widget.TestEntry_EraseSelection.func2(0xc00000e390)
        /home/zjx/workspace/gowork/src/purelib/crashConfirm/fyne/widget/entry_internal_test.go:245 +0x2f
fyne.io/fyne/v2/widget.TestEntry_EraseSelection(0x0)
        /home/zjx/workspace/gowork/src/purelib/crashConfirm/fyne/widget/entry_internal_test.go:249 +0x163

Example code

//part of the Test Code
	e := NewMultiLineEntry()
	e.SetText("00000000000000000000000")
	e.CursorRow = 0
	e.CursorColumn = -1

	var keyDown = func(key *fyne.KeyEvent) {
		e.KeyDown(key)
		e.TypedKey(key)
	}
	var keyPress = func(key *fyne.KeyEvent) {
		keyDown(key)
		e.KeyUp(key)
	}
	keyDown(&fyne.KeyEvent{Name: desktop.KeyShiftLeft})
	keyPress(&fyne.KeyEvent{Name: fyne.KeyRight})

Fyne version

commit 638ae24 (HEAD -> master, origin/master, origin/HEAD)

Go compiler version

1.17.8

Operating system

Linux

Operating system version

OS: Linux r920 4.15.0-159-generic #167-Ubuntu

Additional Information

No response

[andydotxyz]

Fixed on develop ready for next release