QGtkStyle: Fix styling and palette issues related to combo box

Well actually this change is a bit bigger than just that.

*We no longer override the palette you provide in polish so it should
be a bit more frienly toward custom application changes.

* Another issue  was that we  would generate the palette information
when we got the style callback from gtkButton but then the line edits might not yet have been
polished. Hence we now return from the callback and instead post the
update for later.

* We had to modify the PE_Frame entry to draw a raised menu when the
custom combo box delegate was used.

* We now simply ignore custom
qtconfig palette entries when using GtkStyle since they only cause
trouble with it.

Task-number: 250142
Reviewed-by: nrc

1 files changed, 5 insertions, 2 deletions

diff --git a/src/gui/kernel/qapplication_x11.cpp b/src/gui/kernel/qapplication_x11.cpp
index 260a9a4..10fb886 100644
--- a/src/gui/kernel/qapplication_x11.cpp
+++ b/src/gui/kernel/qapplication_x11.cpp
@@ -829,8 +829,11 @@ bool QApplicationPrivate::x11_apply_settings()
                          QColor(strlist[i]));
     }
 
-    if (groupCount == QPalette::NColorGroups)
-        QApplicationPrivate::setSystemPalette(pal);
+    // ### Fix properly for 4.6
+    if (!(QApplicationPrivate::app_style && QApplicationPrivate::app_style->inherits("QGtkStyle"))) {
+        if (groupCount == QPalette::NColorGroups)
+            QApplicationPrivate::setSystemPalette(pal);
+    }
 
     int kdeSessionVersion = QString::fromLocal8Bit(qgetenv("KDE_SESSION_VERSION")).toInt();