[pull] main from microsoft:main #79
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The `GenRTF(...)` was using `\highlight` control word for sending background text color in the RTF format during a copy command. This doesn't work correctly, since many applications (E.g. MSWord) don't support full RGB with `\highlight`, and instead uses an approximation of what is received. For example, `rgb(197, 15, 31)` becomes `rgb(255, 0, 255)`. Also, the standard way of using background colors is `\cbN` control word, which isn't supported as per the [RTF Spec 1.9.1] in Word. But it briefly mentioned a workaround at Pg. 23, which seems to work on all the RTF editors I tested. The PR makes the changes to use `\chshdng0\chcbpatN` for the background coloring. Also did some refactoring to make the implementation concise. ## Validation Steps Performed Verified that the background is correctly copied on below editors: - MSWord - WordPad - LibreOffice - Outlook [RTF Spec 1.9.1]: https://msopenspecs.azureedge.net/files/Archive_References/[MSFT-RTF].pdf
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