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RichTextEntry: keep typing restyled from OnChanged as one undo step

Restyling from OnChanged noted a styled edit, which closed the undo
action after every keystroke, so typing "hello" took five undos where
an Entry, and a RichTextEntry before 0c06e5ad, takes one.

Note what edits started from OnChanged change apart from the outer edit.
Typing that they restyle stays one run; an outer edit without typing
still counts their styling.