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bug#8505: 24.0.50; frame grows horizontally if scroll-bar-mode is non-ni


From: Jan Djärv
Subject: bug#8505: 24.0.50; frame grows horizontally if scroll-bar-mode is non-nil
Date: Fri, 03 Jun 2011 18:45:19 +0200
User-agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; sv-SE; rv:1.9.2.17) Gecko/20110414 Thunderbird/3.1.10

Hello.

Thanks for debugging this.  I couldn't see it as I use Gtk3 without Gnome 3.
I have a fix for this, but savannah has problems right now. I will check it in when savannah sorts itself out.

        Jan D.


Daiki Ueno skrev 2011-06-03 11.38:
(Cc'ed Jan)

Daiki Ueno<address@hidden>  writes:

If I build emacs with ./configure --with-x-toolkit=gtk3 and start it
with emacs -Q, the width of the Emacs window is growing with the lapse
of time.

OK, I finally got it.  This can be reproduced only with specific gtk-3.0
themes (including GNOME3 default), where some widget properties have
larger values than Emacs expects.

Currently Emacs expects the scrollbar width at most 16 pixels.

xfns.c:104442:

  void
  x_set_scroll_bar_default_width (struct frame *f)
  {
    int wid = FRAME_COLUMN_WIDTH (f);

  #ifdef USE_TOOLKIT_SCROLL_BARS
    /* A minimum width of 14 doesn't look good for toolkit scroll bars.  */
    int width = 16 + 2 * VERTICAL_SCROLL_BAR_WIDTH_TRIM;

However, gnome-themes-standard wants to render scrollbars in 22-pixel width.

http://git.gnome.org/browse/gnome-themes-standard/tree/themes/Adwaita/gtk-3.0/gtk-widgets.css#n511

  .scrollbar {
      background-image: none;
      border-style: solid;
      -GtkRange-trough-border: 2;
      -GtkRange-arrow-scaling: 0.444;
      -GtkRange-slider-width: 18;
      -GtkRange-stepper-size: 18;

22 pixels = slider-width(18) + trough-border(2) * 2

I confirmed that my problem is fixed if I increase the default width to
22.

Since it happens with GNOME3 default theme, I would appreciate if it
will be fixed before the pretest, though I don't know how easy to let
Emacs to take account of GTK theme properties.

Regards,





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