Re: Scintilla GTK 4 port

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Me:

>    wrote some code that coalesced adjacent background rectangles and only drew when the background changed

Attached an implementation of this. It doesn't optimize all cases but
should reduce vertical seams within a line. The GTK4 demo doesn't lex
the file so there is only one lexeme per line and the benefit can't
yet be seen.

For debugging, see the spans by uncommenting the line (near the end of
the patch) that shades every second span on a line.

Neil

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