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SaveHTMLToStreamEx is a deprecated method. It is maintained only for a backward compatibility. It does not use HTMLSaveProperties; it uses only its parameters. I do not plan to change it, because it would affect existing projects.
Please use the new method SaveHTMLToStream instead.

Formatted TRichViewEdit control initially contains one empty text line.
LoadRTFFromStream does not clear document before loading, it appends content to the end.
Just call Clear before LoadRTFFromStream.

The fix is sent in a private message.
It will be included in the next update.

The license limits the number of developers, not the number of computers.
You can install it on as many computers as you want, providing that (for your license) no more than 3 developers work with them.
Just install it on a new PC, like you have installed the previous copies.

Yes, it' possible to fix.
I'll provide a solution later in this week.

StyleTemplateID is a value for internal use; it's not supposed to be displayed to the user.

Actually, StyleTemplateID is redundant, since names of style templates are unique by themselves. It was added for efficiency.

Unfortunately, Markdown does not allow empty paragraphs. So TRichView adds a non-breaking space ( ) to them when saving.
It would be possible to save <br> instead. <br> is one of few HTML tags that TRichView parses inside Markdown. However, this is not a paragraph break but a line break inside ...

Include rvfoSaveTextStyles and rvfoSaveParaStyles in RichViewEdit.RVFOptions.
Make sure that RichViewEdit.RVFTextStylesReadMode = RichViewEdit.RVFParaStylesReadMode = rvf_sInsertMerge.

With these settings, if you set RichViewEdit.UseStyleTemplates = True, StyleTemplates will be saved and loaded in ...

TRichView 23.0.1

TRichView has been updated to version 23.0.1.

In addition to fixes, this release allows the use of VCL/Lazarus image format detection when TRichView's own image format detection fails.
VCL image format detection is available for Delphi 10.2 and later.

This feature is useful in ...

Fixed in version 23.0.1

Fixed in version 23.0.1

For this purpose, I recommend using table.CanMergeSelectedCells method.
It checks not only if two or more cells are selected, but also if the selection has a rectangular shape.

As for checking selected cells, use table.IsCellSelected.

I do not understand how it could work in older versions, because image loading was not changed.
The image is saved to RVF correctly.
However, loading is the problem.

TRichView can use two ways to load images from RVF.
1. RVF contains a name of graphic class that was used to save it. TRichView tries ...

TRichView and TRichViewEdit components really need a parent for formatting. You can make them invisible and place on a form, or create an invisible form and place them there.
Another solution is using TRVReportHelper component. It contains an invisible TRichView component (accessible as ...

Oh, I am very sorry.
Open RVItem.pas (or fxmRVItem.pas for FireMonkey), find the line and delete it.
An update will be released ASAP.