Fix(lexical): lost theme and format styles

[mihajlovco]

With this PR we want to resolve the problem with lost theme color from the text when the user wants to apply new color on part of already applied theme color on the text.

• init error desc:

If you color a whole word in one color, say green, and then select the middle part of the word, and change it’s color, say to red, anything on the right hand side or the red letter gets reset to black, instead of remaining green.

Changes

Closes #ISSUE_NUMBER

How Has This Been Tested?

Documentation