bug#50660: 28.0.50; Text artifacting when the cursor moves over text under mouse face that originally displayed a box

[Po Lu]

Eli Zaretskii <eliz@gnu.org> writes:

Thanks for the comments, I'm attaching a rectified patch.

I think the rest of what you've brought up has been resolved by the new
patch, but I would like to clarify something here:

> There's no reason to use -= and += here.  The callers never initialize
> the argument to anything but zero, nor should they.  This function
> _calculates_ the offset, it doesn't _correct_ it.  So a simple
> assignment should do better, because using the above begs the
> question: what could the initial value be?  The callers should add or
> subtract the corrections as they see fit.

I changed the function to use an internal accumulator variable
initialized to 0.  The -= and += is still necessary, as we are inside a
loop which can potentially go through many glyphs that are relevant.

Thanks.

fix-cursor-position.patch
Description: Text Data