Added support for more Linux Distros #71
Merged
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Problem:
On certain linux distros (tested on RedHat Enterprise) an older version of Py GTK is installed by default. This commit adds support for older versions of PyGTK (specifically 2 instead of the newer version 3).
Solution:
Provide backwards compatibility for GTK2, without hurting support for GTK3.
Testing:
Tested that the color picker:
... in GTK 2 environment.
Also tested for GTK3, which was already supported.
Fixes #65