If you remove the last span of a paragraph (on a measured document), using the inline collection, a NullReferenceException is thrown.

As a workaround: either make sure the manipulation happens on a non-measured document, or remove the span by using the RichTextEditor's API:

this.radRichTextEditor.Document.Selection.AddDocumentElementToSelection(span);
this.radRichTextEditor.Delete(false);

Add Korean language to your machine:

Then type 'rkskekfk'. The expected symbols are: "가나다라". However, if you try selecting the entered text, the last symbol disappears:

"http://" prefix is automatically added by the Insert Hyperlink Dialog when the provided URI is to local path or mapped drive, e.g. "Z:\temp".

Workaround 1: Set HyperlinkPattern to something that matches file paths, e.g.:
(this.radRichTextEditor1.RichTextBoxElement.InsertHyperlinkDialog as InsertHyperlinkDialog).HyperlinkPattern = ".*";

Workaround 2: Insert such paths with the "file://" prefix.

The ChangeFontStyle method does not work when setting Underline: 

radRichTextEditor1.ChangeFontStyle( FontStyle.Underline);

Workaround:

radRichTextEditor1.ToggleUnderline();

When a document is imported from HTML, we set locally to the span elements Times New Roman nevertheless it is not declared anywhere. This breaks the document view if for example we decide to change the RadDocument's default font family or even the NormalWeb style's font. The same applies for the font size as well.

Workaround: Clear the FontFamily property after import

foreach (Span span in this.radRichTextBox.Document.EnumerateChildrenOfType<Span>())
{
    span.GetStyleProperty(Span.FontFamilyProperty).ClearValue();

   span.GetStyleProperty(Span.FontSizeProperty).ClearValue();

}

Steps to reproduce:

1. Import the following html:

this.radRichTextBox.Document = new HtmlFormatProvider().Import(@"<h1>Hello</h1><h2>World</h2><p>Lorem ipsum<p>");

2. Set the document's default font family to Comic Sans MS:

this.radRichTextBox.Document.Style.SpanProperties.FontFamily = new FontFamily("Comic Sans MS");

Observe: The font in the document is Times New Roman

Expected: The font should be Comic Sans MS

When changing the theme through ThemeResolutionService.ApplicationThemeName all the application gets changed. Except the ForeColor of the RadRichTextEditor does not get change. Hence the box displays black text on a dark background. Quite unreadable.

Assigning the theme directly in the designer makes everything renders ok.

Sample application attached.

Regrads,
Matthias

The default browser paragraph spacing is not preserved during HTML import-export. 

Workaround:

StyleDefinition normalStyle = this.radRichTextEditor1.Document.StyleRepository[RadDocumentDefaultStyles.NormalWebStyleName];
normalStyle.ParagraphProperties.SpacingAfter = 20;
normalStyle.ParagraphProperties.SpacingBefore = 20;

Importing this:

<p>This is a paragraph.</p>
<p>
	This is a paragraph.
</p>

should import two identical paragraphs, but it actually import it like this:

This is a paragraph.
 This is a paragraph.

It has a leading space before the second paragraph.