[gtkmm] Gtk::CellRenderer for text with optional icon

[ERDI Gergo <cactus cactus rulez org>]

Hi,

in case you've missed it in my Advogato diary, I'm crossposting it here:

"Gtk::CellRendererIconText

While working on making Guikachu[http://advogato.org/proj/Guikachu/] look 
more professional by using the features Gtk::TreeView has to offer, I 
encountered a problem with packing icons and texts inside a column: as you 
can see here[http://cactus.rulez.org/files/treeview-align.png], due to the 
way TreeViewColumn works, the same width is allocated for every icon. This 
looks very bad, especially for trees where only leaf items have icons. So 
I coded up CellRendererIconText[http://cactus.rulez.org/projects/gnome/cellrenderer-icontext/], 
and made it general enough that it could be used by other projects. This 
screenshot[http://cactus.rulez.org/projects/guikachu/guikachu-gnome2-ui.png] 
shows (on the right-hand side) the new cell renderer in action. The 
expander-less indentation is done by another custom cell renderer, but I 
haven't cleared up that one enough to publish yet."

Long story short, the code is here:
http://cactus.rulez.org/projects/gnome/cellrenderer-icontext/

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