Public bug reported:
Meld barfs up a bunch of tracebacks on stderr when the desktop's gtk3
theme has scrollbar stepper buttons. This is particularly annoying when
working at the command line, since all those traceback messages push
everything else out of my terminal window.
Example traceback:
Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/meld/diffmap.py", line 138, in do_draw
width, height)
cairo.Error: invalid value (typically too big) for the size of the input
(surface, pattern, etc.)
It seems that DiffMap.do_draw() subtracts the combined height of the
scrollbar steppers from self._scroll_height (no matter what the height
is, and uses the result as the height argument to
cairo.Surface.create_similar(). When self._scroll_height is only 1,
that argument ends up being a negative number, which chokes cairo.
You won't see the bug unless your gtk3 theme uses scrollbar stepper
buttons. To reproduce, find a theme with something like this in its
gtk-3.0/gtk-widgets.css:
-GtkScrollbar-has-backward-stepper: true;
-GtkScrollbar-has-forward-stepper: true;
-GtkRange-stepper-size: 15px;
I can reproduce the bug by comparing directories while using any of
these themes:
Greybird-Mod
https://www.gnome-look.org/p/1015000/
Windows 8 Gtk3
https://www.gnome-look.org/p/1013223/
Clearlooks-Phenix v6
https://www.gnome-look.org/p/1013756/
DarkMint
https://www.gnome-look.org/p/1013679/
** Affects: meld
Importance: Unknown
Status: Unknown
** Affects: meld (Ubuntu)
Importance: Undecided
Status: New
** Bug watch added: GNOME Bug Tracker #773985
https://bugzilla.gnome.org/show_bug.cgi?id=773985
** Also affects: meld via
https://bugzilla.gnome.org/show_bug.cgi?id=773985
Importance: Unknown
Status: Unknown
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https://bugs.launchpad.net/bugs/1639474
Title:
cairo.Error: invalid value from do_draw() when gtk3 theme has
scrollbar stepper buttons
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