Gtk_Tree_View unreadable on displays with few colors


When displaying a Gtk_Tree_View, when rules are enabled and/or a column
is sorted, the background color for ruled/sorted cells is generated
through a call to get_darkened_gc, which has the side effect of
allocating a color. 

When working on a display with few colors, the closest color is used,
and in some cases this color can be something very dark, making the tree

The "rules" can be disabled, but (unless I am wrong) there is no API to
disable sorting. Have I missed this API ? (or is there a known
workaround ?)

In the case where there is no known solution, I can open a bugzilla
entry and suggest a patch...

Best regards,

for the GtkAda team

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