Currently ignored words are marked only in-memory using internal properties of the document model. Make them persist, similar to what MS Word do.

Note: In the DOCX format, the document is marked as "clear" (doesn't contain spell check errors) and all misspelled words are enclosed with an errProof annotation.

Improve the performance when multiple paragraphs are selected and deleted.

Currently, when an option is chosen from the drop-downs in Page Layout -> Page Setup -> Size/Margin/Orientation/Columns, the command is executed, but the item corresponding to the current value is not selected. For example, if the caret is in a Section with A3 size, Size -> drop-down -> A3 should be selected.

Currently RadDocument contains a lot of built-in (latent) table styles, which are always shown in the TableStylesGallery. Introduce API allowing to hide some of them.

An useful option would be to export the text without the bullets in it.

Introduce an option enabling only proportional resizing to be allowed in the ImageSelectionAdorner (side middle thumbs should be disabled). The option can be added in the RadRichTextBox's ImageSelectionAdornerSettings as it already contains CanRotate, CanDrag, CanResize.

Note that Images could also support Lock aspect ratio property, which is different.

Currently, an ArgumentException is thrown when trying to import an image with negative dimensions. In this scenario, we could import the document and skip the image, or read the size of the content.

Introduce the support for the border property (with type, size, color...) for a span elements.

In OOXML, this looks like:

<w:r>
  <w:rPr>
    <w:rFonts w:eastAsia="Times New Roman"/>
    <w:sz w:val="45"/>
    <w:szCs w:val="45"/>
    <w:bdr w:val="single" w:sz="12" w:space="0" w:color="000000" w:frame="1"/>
  </w:rPr>
  <w:t>Div with border for Telerik</w:t>
</w:r>
<w:r>

Provide the ability to enter custom values (not listed in the drop-down) in Font size combo box.

Profiling results show bottleneck in the line-breaking logic within Paragraph MeasureOverride.

Introduce an option to change the character which follows the list level symbol. By default this is a Tab character, however, they can be the following:
- Tab
- Space
- Nothing (none following character)

In OOXML, this is described using the 'suff' element.
In MS Word, this setting could be changed by selecting the bullet/number of the list item -> Context Menu -> Adjust List Indents -> Follow number with:.

Implement nested mail merge - creating mail merge reports using master-detail tables in a data source.

Typical example of this is creating an invoices with mail merge, where each invoice contains a list of items.

Workaround: for some scenarios creating custom merge field which evaluates to Table could simulate this behavior:
http://www.telerik.com/forums/merge-reports#lUdH39ww00SnEhTLLlrXwA

When a table cell contains nested table, and the paragraph after the nested table is empty, this paragraph could be collapsed, as in MS Word. This gives better look to nested tables, similar to how browsers visualize nested HTML tables.

Note that the paragraph should be visualized when the caret moves the position inside the paragraph.

Currently the paragraph is visualized with its full height, making the layout different than MS Word - it appears that there are redundant space after the nested table.

When a document with table of contents is exported to HTML, the fore color, alignment of the page numbers are not respected; the tab leader is missing and the entries are underlined as hyperlinks.

Most of the CJK characters are not defined or don't look good in fonts not specifically designed for CJK.

Because of this it would be convenient the font to be automatically changed to MS Mincho in case the user starts writing CJK characters. 

Note that if the current font supports CJK (for example Arial Unicode MS), the font is not changed to MS Mincho.

In MS Word the user could add different effects to the selected text. This could be done through Font -> Text Effects... button.

In HTML the width of the columns in a table could be set as proportions of the remaining free space using width="3*"

Example:
<TABLE>
<COLGROUP>
   <COL width="30">
<COLGROUP>
   <COL width="30">
   <COL width="0*">
   <COL width="2*">
<COLGROUP>
   <COL width="1*">
   <COL width="3*">
<THEAD>
<TR><TD> ...
...rows...
</TABLE>



First the user agent will allot 30 pixels to columns one and two. Then, the minimal space required for the third column will be reserved. The remaining horizontal space will be divided into six equal portions (since 2* + 1* + 3* = 6 portions). Column four (2*) will receive two of these portions, column five (1*) will receive one, and column six (3*) will receive three.

Note: This is not supported even by MS Word. 

Add support for importing of imaged defined with VML's v:imagedata inside v:image or v:shape. Currently such images are just skipped.

Documents that are protected using WordsProcessing could be protected using SHA256, SHA512 and SHA384 algorithms. However these algorithms are currently not supported by RichTextBox. Thus, a document protected via WordsProcessing could not be unprotected in RadRichTextBox and NotSupportedException is thrown. Add support for these three algorithms.
Documents protected in MS Word 2013 could not be unprotected in RRTB as well. Exception thrown: Unsupported hashing algorithm: SHA512.

Add support for = (Formula) fields, including the scenario with referencing other table cells.

More information: https://support.office.com/en-us/article/Field-codes-Formula-field-32d5c9de-3516-4ec3-80ed-d1fc2b5bc21d?ui=en-US&rs=en-US&ad=US