Bug#576624: Segfault when loading the background pixbuf failed

[Wen-Yen Chuang]

tags 576624 patch
thanks

The attached patch will fix both problems for
vte_terminal_set_background_image_file() and
vte_terminal_set_background_transparent().

Upstream git codebase has changed much, so I will not send this patch to
upstream.

The most easy way to test the patch:
1. run Xephyr (and do not set any background)

2. run evilvte in Sid(and Sueeze)

3. Right-click in evilvte and select "Toggle background"

   It is cycled by the sequence:
    "background image at $HOME/.config/evilvte/background.png",
    "pseudo transparency",
    "no background and no transparency (aka black)"

   When there is no $HOME/.config/evilvte/background.png,
   evilvte will show nothing as background(aka black).

   You may link any image file to $HOME/.config/evilvte/background.png.
   (All image formats that can be processed by GTK+, not only png.)

4. Everything should be fine with the patch.

Kind regards
 Wen-Yen Chuang (caleb)
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