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

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Message #191 received at 19972 <at> debbugs.gnu.org (full text, mbox):

From: martin rudalics <rudalics <at> gmx.at>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: steve <at> sanityinc.com, jan.h.d <at> swipnet.se, 19972 <at> debbugs.gnu.org
Subject: Re: bug#19972: Font size change doesn't update (window-total-width)
Date: Wed, 04 Mar 2015 19:45:39 +0100

> Feel free to ignore, btw.  But to clarify, what I had in mind was call
> MoveWindow, and wait for WM_SIZE before we call change_frame_size.  I
> have no idea whether this is a good idea, though.

It's not the idea that bothers me but the implementation.  Looking at
what Jan did in x_wait_for_event it seems very unlikely that I could
come up with an equivalent solution.  Think of the input un-/blocking
part:

  int level = interrupt_input_blocked;
  ...
  while (f->wait_event_type)
    {
      pending_signals = true;
      totally_unblock_input ();
      /* XTread_socket is called after unblock.  */
      block_input ();
      interrupt_input_blocked = level;

Would this work on Windows?  And on Gtk he does

      (void)gtk_events_pending ();
      gdk_flush ();

before calling x_wait_for_event.  Would we have to flush old messages on
Windows and if so how?  All this is probably over my head.

> But in any case, are you saying that if we call change_frame_size with
> dimensions that Windows doesn't like (can that happen?

I'm quite confident that Drew will eventually come up with an
appropriate scenario.

> ), then we will
> get a WM_SIZE message telling us to change the size to something else?
> Does this really happen under some conditions?

ISTR that I was suprised by Windows once or twice doing that but I can't
give you any details any more.  Windows is very attentive in this
regard.  OTOH it is by far the most permissive system wrt which changes
it allows.

martin

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