Public bug reported:
1. Set GtkTreeView is composited
2. At parent window of GtkTreeView paint GtkTreeView context by cario_paint
function.
3. Nothing painted.
If change function cairo_paint to cairo_paint_with_alpha(cr, 0.99),
everything is okay.
There is not such problem at gusty release.
GtkTreeView use two gdkwindow, one is "window", other is "bin_window".
"window" is parent of "bin_window". by moving bin_window position,
implement TreeView scroll.
When set GtkTreeView composited, GtkTreeView will expose to offscreen
buffer.
If gtk_cairo_set_source_pixmap(cr, tree->window), cairo_paint(or
cairo_paint_with_alpha(1.0)) can't work. but
(cairo_paint_with_alpha(0.99) can work.
If gtk_cairo_set_source_pixmap(cr, get_binwindow(tree)), cairo_paint(or
cairo_paint_with_alpha(1.0)) can work.
I guess X meet problem when window with child is composited.
** Affects: ubuntu
Importance: Undecided
Status: New
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Cario_paint can NOT paint composited GtkTreeView context at Hardy
https://bugs.launchpad.net/bugs/202046
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