[Sugar-devel] Gtk 3.10 icon size regression

[Daniel Narvaez]

Ok, we looked more into this and it's an horrible, horrible mess. Several
activities are using Gtk.IconSize, often just passing it to Gtk.Image. Here
is the best possible plan I can think of:

- Change sugar and sugar-toolkit-gtk3 to never use Gtk.IconSize explicitly.
Just use pixels, the sizes stuff is half deprecated and of very little use.
- Set the proper pixel_size on the toolbutton image.

Hacks to help backward compatibility

- Register sugar specific sizes (LARGE_TOOLBAR, MENU) with the deprecated
Gtk.icon_size_register function.
- Overwrite Gtk.IconSize.* with the sugar specific sizes. This will only
work at python level, but should help a lot with activities that uses them.

Cleanup

- Drop sizes from settings.ini
- Deprecate Icon's icon_size property.
- Suggest that activity authors never use Gtk.IconSize.

I'm not sure this will fix everything, but should at least cover the large
majority of the issues.
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