[PATCH installer] ui: gtk3: set up proper RGBA visual for main window

[Christoph Heiss <c.heiss@proxmox.com>]

This properly fixes all instances of broken damage-tracking with dialogs
and other overlaying widgets on top of the WebKit2 view.

By using RGBA instead of a the default RGB visual, the GTK <-> X server
interaction for compositing widgets on top of each other seem to work
correctly.

This was previously worked around in one instance and thus also
effectively reverts commit

  55c764163 ("gui: redraw window after closing disk setup dialog")

.. as it is now no longer needed.

Signed-off-by: Christoph Heiss <c.heiss@proxmox.com>
---
 proxinstall | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/proxinstall b/proxinstall
index 49b1612..51ead26 100755
--- a/proxinstall
+++ b/proxinstall
@@ -236,6 +236,13 @@ sub create_main_window {
 
     Proxmox::UI::init_gtk($gtk_state, $iso_env);
 
+    # make it play nice without a compositor, i.e. this enables proper damage
+    # tracking in GTK in combination with WebKit2
+    my $visual = $window->get_screen()->get_rgba_visual();
+    if ($visual) {
+        $window->set_visual($visual);
+    }
+
     $window->show_all;
     $window->present();
 }
@@ -1651,7 +1658,6 @@ sub create_hdoption_view {
     $dialog->show();
 
     $dialog->run();
-    $gtk_state->{window}->queue_draw();
 
     my $get_float = sub {
         my ($entry) = @_;
-- 
2.54.0