Crash in widget.(*RichText).updateRowBounds.func1

[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_MultilineWrapping_DeleteWithBackspace) data, and then the following crash appeared. Originally I thought it was similar to the issue #3288 & #3289, but this requires two other corrupt data to trigger, and finally crash in different location.

How to reproduce

The simplified test code is in Example code

Screenshots

CrashLog

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

goroutine 100 [running]:
testing.tRunner.func1.2({0x87e8c0, 0xc000024288})
        /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, 0xc000024288})
        /home/zjx/.local/go/src/runtime/panic.go:1038 +0x215
fyne.io/fyne/v2/widget.(*RichText).updateRowBounds.func1({0xc00083e6e0, 0x1, 0xc0005adb78})
        /home/zjx/workspace/gowork/src/purelib/crashConfirm/fyne/widget/richtext.go:381 +0xbc5
fyne.io/fyne/v2/widget.(*RichText).updateRowBounds(0xc0001646e0)
        /home/zjx/workspace/gowork/src/purelib/crashConfirm/fyne/widget/richtext.go:411 +0x106
fyne.io/fyne/v2/widget.(*RichText).Refresh(0xc0001646e0)
        /home/zjx/workspace/gowork/src/purelib/crashConfirm/fyne/widget/richtext.go:89 +0x1e
fyne.io/fyne/v2/widget.(*RichText).insertAt(0xc0001646e0, 0x5, {0xc0005add78, 0x1})
        /home/zjx/workspace/gowork/src/purelib/crashConfirm/fyne/widget/richtext.go:226 +0x285
fyne.io/fyne/v2/widget.(*Entry).TypedRune(0xc00000c1e0, 0x30)
        /home/zjx/workspace/gowork/src/purelib/crashConfirm/fyne/widget/entry.go:738 +0x11b
fyne.io/fyne/v2/test.typeChars({0xc0005ade20, 0x6, 0xc0005ade68}, 0xc0005adea0)
        /home/zjx/workspace/gowork/src/purelib/crashConfirm/fyne/test/test.go:311 +0x39
fyne.io/fyne/v2/test.Type({0x976960, 0xc00000c1e0}, {0x8ab7bd, 0x6})
        /home/zjx/workspace/gowork/src/purelib/crashConfirm/fyne/test/test.go:232 +0xbc
fyne.io/fyne/v2/widget_test.TestEntry_MultilineWrapping_DeleteWithBackspace(0x0)
        /home/zjx/workspace/gowork/src/purelib/crashConfirm/fyne/widget/entry_test.go:428 +0xc5

Example code

//part of the Test Code
	entry := widget.NewMultiLineEntry()
	entry.Wrapping = fyne.TextWrapWord
	entry.Resize(fyne.NewSize(64, -3.0268908e+12))
	test.Type(entry, "\x20\x30\x30\x30\xD4")
	test.Type(entry, "\x20\x30\x30\x30\xD4\x20")

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]

This seems to have been resolved by v2.3.0