MultiLineEntry widget Press the Ctrl+left arrow will panic

[langxlm]

Checklist

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

Describe the bug

I use MultiLineEntry in my windows program . when i run the process in win10, focus in that widget ,press Ctrl+left-arrow, the proecess panic .

error message fyi :

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

goroutine 53 [running]: fyne.io/fyne/v2/widget.getTextWhitespaceRegion({0xc00b550450, 0xc0004e1ef0, 0xc0004e1f00}, 0x7ff6c25208ee, 0x1) C:/Users/langxli/go/pkg/mod/fyne.io/fyne/v2@v2.4.5/widget/entry.go:1957 +0x1a9 fyne.io/fyne/v2/widget.(Entry).registerShortcut.func5({0x7ff6c37d3280, 0xc00a6e01b0}) C:/Users/langxli/go/pkg/mod/fyne.io/fyne/v2@v2.4.5/widget/entry.go:979 +0x5b fyne.io/fyne/v2/widget.(Entry).registerShortcut.func7({0x7ff6c37d3280, 0xc00a6e01b0}) C:/Users/langxli/go/pkg/mod/fyne.io/fyne/v2@v2.4.5/widget/entry.go:1016 +0x32 fyne.io/fyne/v2.(ShortcutHandler).TypedShortcut(0xc000554048, {0x7ff6c37d3280, 0xc00a6e01b0}) C:/Users/langxli/go/pkg/mod/fyne.io/fyne/v2@v2.4.5/shortcut.go:21 +0x77 fyne.io/fyne/v2/widget.(Entry).TypedShortcut(0xc00046ef00, {0x7ff6c37d3280, 0xc00a6e01b0}) C:/Users/langxli/go/pkg/mod/fyne.io/fyne/v2@v2.4.5/widget/entry.go:825 +0x29 fyne.io/fyne/v2/internal/driver/glfw.(window).triggersShortcut.func1() C:/Users/langxli/go/pkg/mod/fyne.io/fyne/v2@v2.4.5/internal/driver/glfw/window.go:906 +0x2a fyne.io/fyne/v2/internal/driver/common.(Window).RunEventQueue(0xc0000021e0) C:/Users/langxli/go/pkg/mod/fyne.io/fyne/v2@v2.4.5/internal/driver/common/window.go:35 +0x3e created by fyne.io/fyne/v2/internal/driver/glfw.(*gLDriver).createWindow.func1 C:/Users/langxli/go/pkg/mod/fyne.io/fyne/v2@v2.4.5/internal/driver/glfw/window.go:960 +0x13b

How to reproduce

go mod fyne.io/fyne/v2 v2.4.5

code : textInput := widget.NewMultiLineEntry() textInput.SetText(string(scriptContent))

Screenshots

No response

Example code

textInput := widget.NewMultiLineEntry()
textInput.SetText(string(scriptContent))

Fyne version

2.4.5

Go compiler version

go1.17

Operating system and version

Winodw10

Additional Information

No response

[hfmrow]

Hi, langxlm

I'm trying to learn more about your issue, but unfortunately, without any success.

Fyne version

2.4.5

Go compiler version

go1.22.5

Operating system and version

Windows 10 Entreprise LTSC v21H2 b19044.2486

---

Unable to reproduce

Used code (inside dev environment):

        test := widget.NewMultiLineEntry()
        test.SetText("test ctrl left")
        oldContent := mainWindow.Canvas().Content()
        mainWindow.SetContent(test)
        mainWindow.Show()

        go func(oC fyne.CanvasObject) {
            time.Sleep(time.Second * 15)
            mainWindow.SetContent(oldContent)

        }(oldContent)

keys used: [ctrl+left and right arrow], [ctrl+shift+left and right arrow]

work well...

only go version (1.22.5) change

[andydotxyz]

I also cannot replicate this issue. Is it possible that it relates to the un-shared scriptContent bytes?

[langxlm]

thx all ! i found the problem .

func getTextWhitespaceRegion(row []rune, col int, expand bool) (int, int)

this funtion when col is zero , will cause the endCheck is -1 , and then slice out of range . end := strings.IndexByte(toks[endCheck:], c)

so when press the ctrl+left in a empty row , will occur this panic. @andydotxyz @hfmrow

[andydotxyz]

Looking at the code this has already been solved in #4662. I recommend testing against v2.5.0-rc1 to check.