//using System;

//usign System.Windows.Controls;

Two consecutive lines with commented using sections result in ArgumentOutOfRangeException in SyntaxEditor with CSharpFoldingTagger.

/* and */ words are start /end words for multiline comments in C#/SQL/VB 

They should be outside strings when they form a comment block.

Character data sections are not recognized and colored by the XmlTagger in SyntaxEditor.

Visual Studio:

SyntaxEditor:

Also parsing such elements is wrong:

Expanded OK:

Collapsed BUG (Node is closed but it shouldnt):

issue 2 - single line CDATA does not need folding button

Good morning,

can You implement in one of the next releases the regex and case sensitive search? I provided you the Visual Studio 2019 search screenshot

When the variation is changed in the VisualStudio2013 theme, the Foreground is not updated. 

As a workaround, you can reset the Template of the control:

var template = this.syntaxEditor.Template;
this.syntaxEditor.Template = null;
this.syntaxEditor.Template = template;

After putting a folding region out of the viewport by scrolling and then bringing it back, the folding region is not drawn correctly when typing new lines into it.

In some scenarios, an ArgumentException is thrown when a folding region with selected text is collapsed. An example can be seen below:

When the control is inside ScrollViewer and you click it, focus is lost and caret disappears. Some controls have built in ScrollViewer , for example LayoutControl so placing the editor in LayoutControl also leads to the same issue.

Generally placing the syntaxeditor in scrollviewer is risky for the vertical virtualization so at least a height should be set to the control. In R2 2020 SP, an exception will be thrown if Syntax Editor with no height is added in scroll viewer or stack panel or other panel which measures vertically with infinity.

Workaround for this issue:

For example:

some text // some comment

some text 2 // some comment 2

Specified argument was out of the range of valid values.
Parameter name: span

StackTrace:

SyntaxEditor is in RadListBoxItem.

Entering space key does not produce text change and gets the focus lost our of the editor.

Workaround:

    private void RadSyntaxEditor_PreviewKeyDown(object sender, KeyEventArgs e)
        {
            if (e.Key == Key.Space)
            {
                (sender as RadSyntaxEditor).Insert(" ");
                e.Handled = true;
            }
        }

SyntaxEditor showing XML/Html/XAML File and XMlFoldingTagger is registered.

Deleting the last bracket symbol ">" results in exception in XMLFoldingTagger.cs

Hello,

When we resize the syntaxEditor control, the folding buttons moved. You can reproduce this isssue in your demos.

1. Reduce the contents of the sample
2. Increase the size of sample window and see the buttons are not besides the line

Best regards,