Need to "push" updates when changing the client view while active
Enable chaining of methods
Generate title pixmap with the exact widht, so that scaling is not necessary
Avoid the safety net here, this operation shouldn't fail in theory
This can be already done in the event handler
Replace loops with a simple foreach method
Inline method
Generate a new XID; not sure if reuse is valid
Only map thumbnail in show() method; update in update()
Order is important! Also: configure highlight setting
Set highlighting when updating thumbnails
Remove texture loading from c'tor -> do it later in update()
Only set a flag when rectangle is updated
Additional icon pixmap loading method; Don't call gl::context::run()
Rename & reorganize highlight methods
Rename configure_thumbnail_window and remove boolean flag
Set flag in notify() methods and call update
Check flags in update() and call methods if necessary
Reorder method prototypes
Update default colors