C# editor pressing CTRL+BACKSPACE to erase a word causes an error dialog to appear when the word is an unclosed "

[vsfeedback]

This issue has been moved from a ticket on Developer Community.

---

[severity:I'm unable to use this version]
Tested with

• Version 17.13.1
• Version 17.13.2
• Version 17.14.0 Preview 1.1

Use project types:

• WPF
• WinForms
• Console

*The code editor for VB doesn't have this issue.

Problem

I was erasing the string text in C# and I came across this error. I then replicated it down to simply having an unclosed double quote at the end of a line, if you CTRL+BACKSPACE to erase the quote you get an error about how 'end' must not be less than 'start'.

For example. if you have this code:

private void button1_Click(object sender, EventArgs e)
{
    Clipboard.SetData("
    MessageBox.Show(RuntimeInformation.FrameworkDescription);
}

Place the caret at the end of the Clipboard line and press CTRL+BACKSPACE you'll trigger the error. It also happens simply by having an unclosed quote. Putting the caret at the end of the line with the single " and pressing the key combination triggers it:

private void button1_Click(object sender, EventArgs e)
{
    "
    MessageBox.Show(RuntimeInformation.FrameworkDescription);
}

[sharwell]

This exception is being thrown in CSharpTextStructureNavigatorProvider.GetExtentOfWordFromToken:

roslyn/src/EditorFeatures/CSharp/TextStructureNavigation/CSharpTextStructureNavigatorProvider.cs

Line 114 in 73abcff

while (CharAt(contentEnd - 1) == '"')

[CyrusNajmabadi]

Wouldn't is be

roslyn/src/EditorFeatures/CSharp/TextStructureNavigation/CSharpTextStructureNavigatorProvider.cs

Line 118 in 73abcff

return (TextSpan.FromBounds(start, contentStart), TextSpan.FromBounds(contentStart, contentEnd), TextSpan.FromBounds(contentEnd, end));

sam?

[sharwell]

It could be. I was going based on PerfView data and the stack could be off by a line. The exception is inside a call to TextSpan.FromBounds.

[Pyritie]

The fix for this has made it so ctrl+backspace is now only deleting two tabs instead of the whole line, if you have a line with nothing but tabs.