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Re: Test to determine character left-overhangs a tab stretch.

From: Eli Zaretskii
Subject: Re: Test to determine character left-overhangs a tab stretch.
Date: Mon, 12 Nov 2018 18:13:29 +0200

> Date: Sun, 11 Nov 2018 18:06:10 -0800
> From: Keith David Bershatsky <address@hidden>
> I am working on feature requests #22873 (multiple fake cursors); and, #17684 
> (crosshairs).
> Fake cursors are placed on a line in the order of left to right.  
> ns/x_draw_window_cursor calls draw_phys_cursor_glyph, which calls draw_glyphs.
> Certain wide characters to the immediate right of a tab stretch cause the tab 
> stretch to be redrawn -- erasing the fake cursors that were previously placed 
> along the tab stretch.  Here is a screenshot depicting a tab stretch after 
> the cursors have been erased from it -- the tab stretch had red hbar cursors 
> before they were erased:
> https://www.lawlist.com/images/glyph_overhang_001.png
> How can programmatically test for this situation?

Not sure what you are asking, but the logic for deciding when to
redraw due to overhang is entirely inside draw_glyphs, so you could do
the same as what it does.

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