Re: resize windows horizontally with the mouse

[martin rudalics]

> GTK+3.

I see.  What does

(frame-parameter nil 'scroll-bar-width)

give?  Can you try to trace the following function in gtkutil.c

static void
update_theme_scrollbar_width (void)
{
#ifdef HAVE_GTK3
  GtkAdjustment *vadj;
#else
  GtkObject *vadj;
#endif
  GtkWidget *wscroll;
  int w = 0, b = 0;

  vadj = gtk_adjustment_new (XG_SB_MIN, XG_SB_MIN, XG_SB_MAX, 0.1, 0.1, 0.1);
  wscroll = gtk_scrollbar_new (GTK_ORIENTATION_VERTICAL, GTK_ADJUSTMENT (vadj));
  g_object_ref_sink (G_OBJECT (wscroll));
  gtk_widget_style_get (wscroll, "slider-width", &w, "trough-border", &b, NULL);
  gtk_widget_destroy (wscroll);
  g_object_unref (G_OBJECT (wscroll));
  w += 2*b;
  if (w < 16) w = 16;
  scroll_bar_width_for_theme = w;
}

and look what values w and b are set to?  IIRC the rounding to 16 is
responsible for a similar gap on my GTK+3 Emacs.

> Can and will.

Fine.

Thanks, martin