Spaces in the text are disappearing when several tabs key are added (using the Tab key). In some cases, parts of words are missing (off the visible page) or are reordered.

Steps to reproduce: 
1. Write some words in a line inside a paragraph, set with justified alignment.
2. Press Tab few times, until the caret goes to the next line
Result: The spaces are not visible, some parts at the end of the text disappear. Sometimes the words are reordered.

When large image is set as watermark and the document is exported to PDF, the image is with significantly worse quality.

When a custom list is created and applied over different parts in the text (which are separated from text without list), the export to DOCX and RTF format is wrong as the list numbering is not correct. Instead of having several lists starting from index 1, there is only one list with continuing numbering in the exported document.

When floating image is anchored to the first position of the first paragraph on a page, and there are some empty paragraph on the previous page, sometimes the image is positioned on the previous page instead of along the paragraph.

This should be similar to the one in HtmlFormatProvider and RtfFormatProvider: Html/RtfImportSettings.FontSubstituting event.

When exporting RadDocument to HTML comments are omitted. 

MS Word, for example, adds comments as end notes using JavaScript.

If nested comments are present in the document, the end users cannot delete the nested one. If they put the caret inside the inner comment, or even inside the balloon associated with the inner comment, and press "Delete Comment", the most outermost comment is deleted instead of the current one.

In Word, slashes, dots, etc. are treated as separate words when moving the caret with Ctrl + Key.Right and Ctrl + Key.Left.

Exporting document containing Hebrew text to PDF results in correct text (letter-by-letter), but with wrong text flow: letters in the words are inverted and flow left-to-right instead of right-to-left.

Implement Mirror margins similar to the option in MS Word.

In MS Word, this is controlled using Page Setup dialog -> Margins -> Pages -> Multiple pages: -> Mirror margins. Another possible options are 2 pages per sheet and Book fold.

The CSS styling for the "p" selector is not imported as a "NormalWeb" style. For example the following:

<style type="text/css">p {margin-top:0; margin-bottom:0;}</style>

should be imported as SpacingBefore and SpacingAfter set to 0 in Normal (Web) style.

When HTML is imported it may contain invalid images. In such case show the alternative text if there is such text.

Left indent and hanging indent of paragraph in a list are changed when the document is exported to HTML and then imported.

Steps to reproduce:
- Add text.
- Apply list over the text.
- Export the document to HTML
- Import the exported HTML
Expected: The paragraph in the list preserves its left indent (18 px) and hanging indent (18 px).
Actual: The paragraph in the list is with left indent 18 px and hanging indent 0 px.

RadRichTextBox's behavior is to reject/accept the whole revision where the caret or selection is. Modify the behavior so only the selected region is rejected/accepted and the rest is split into two revisions. Consider multiple selection ranges as well.

When ignoring incorrect words through the Spelling dialog and you reach the last word in the document which is incorrect, only one more word from the beginning of the document is checked prior showing a message that the check is complete. Instead, all incorrect words starting from the beginning of the document should be spellchecked. 

The issue is reproduced when adding the incorrect words to the dictionary. In order to reproduce the issue, only "Ignore" or "Add to Dictionary" action should be applied. When the actions are mixed, the issue is not reproduced.

Workaround: before opening the spellchecking dialog, move caret at the beginning of the document
this.radRichTextBox.Document.CaretPosition.MoveToFirstPositionInDocument();

Add possibility to import files from MHTML format.

Add possibility to export files in MHTML format.

Current implementation of Text UI automation pattern doesn't support obtaining the attributes of the selection, e.g. bold, italic, etc.

The API allows returning custom ITextRangeProvider where the behavior could be implemented , but this requires a lot of work. 

If this is built-in, the API will allow getting the attributes as follows:

            var automationPeer = (RadRichTextBoxAutomationPeer)FrameworkElementAutomationPeer.FromElement(this.radRichTextBox);
            TextPattern textPattern = (TextPattern)automationPeer.GetPattern(PatternInterface.Text);

            object isItalic = textPattern.GetSelection()[0].GetAttributeValue(TextPattern.IsItalicAttribute);
            if (isItalic == TextPattern.MixedAttributeValue)
            {
                // mixed
            }
            else
            {
                bool italic = (bool)isItalic;
            }

Currently, AutomationElement.NotSupported is always returned.

When the caret position is inside Table and a page break is inserted, the table should be split into two tables with a page break between.