diff -r 3b1da2848fc7 -r d3bac044e0f0 src/gui/kernel/qaction.cpp
--- a/src/gui/kernel/qaction.cpp	Fri Feb 19 23:40:16 2010 +0200
+++ b/src/gui/kernel/qaction.cpp	Fri Mar 12 15:46:37 2010 +0200
@@ -715,6 +715,10 @@
     it is displayed to the left of the menu text. There is no default
     icon.
 
+    On Symbian the icons which are passed to softkeys, i.e. to actions with
+    softkey role, need to have pixmap alpha channel correctly set otherwise
+    drawing artifacts will appear when softkey is pressed down.
+
     If a null icon (QIcon::isNull() is passed into this function,
     the icon of the action is cleared.
 */