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bug#19972: 24.4; Font size change doesn't update (window-total-width)

From: Eli Zaretskii
Subject: bug#19972: 24.4; Font size change doesn't update (window-total-width)
Date: Tue, 03 Mar 2015 05:36:00 +0200

> From: Joost Kremers <address@hidden>
> Cc: address@hidden, address@hidden
> Date: Mon, 02 Mar 2015 23:26:58 +0100
> >> Sorry, forgot that. `window-width' doesn't have the same issue. On my
> >> system, with a maximised Emacs frame (Emacs version, it
> >> returns 236 before `custom-push-theme' + `face-spec-recalc', and 188
> >> after it, even without doing `C-x 3' followed by `C-x 1'.
> >
> > In that case, I guess if you call (window-total-width 'round), you
> > will see the correct value even before "C-x 3", right?
> No, it doesn't. It still returns 240, i.e., the same value returned by
> (window-total-width).
> (window-width) returns 188.

That's very strange, since they use the same data.  But if Martin's
patch fixes the issue for you (does it?), we don't need to pursue this

> > Joost, could you find out where does w->pixel_size change in your
> > recipe (where 'w' is the pointer to the window displaying *scratch*)?
> I'd be happy to, but...
> > If my guess is correct, it should change twice: once as shown below in
> > the backtrace I produced, and then once more, where it changes back to
> > the dimensions of your display.  We are interested to know where is
> > that second time, and who calls that code.
> >
> > One way of finding this out is to put a watchpoint in GDB on
> > w->pixel_size.  Let me know if you need more detailed instructions for
> > how to do it.
> That would be great, since I have only basic knowledge of GDB.

Given Jan's explanation of the issue, I don't think this is needed


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