Follow-up Comment #1, bug #15603 (project freeciv):
There's a tooltip API in Gtk+, GtkTooltip
<http://library.gnome.org/devel/gtk/stable/GtkTooltip.html>, which has some
integration with GtkTreeView
<http://library.gnome.org/devel/gtk/stable/GtkTreeView.html> and would be
fairly easy to implement that with.
However, GtkTooltip is only available from Gtk+ 2.12 (released 2007).
Currently, Freeciv claims to only require Gtk+ 2.4.0 (released 2004), in
configure and INSTALL. This might not be a sufficiently desirable feature on
its own to force a dependency to 2.12. (What version of Gtk is used for the
There is another tooltip API in 2.4.0, GtkTooltips
<http://library.gnome.org/devel/gtk/stable/GtkTooltips.html>, but it's
deprecated and I suspect can't be used to implement this anyway.
However, I've no idea whether Freeciv really can still build against 2.4.0 as
claimed; it wouldn't surprise me if we've quietly started using newer features
and no-one's noticed.
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