Squish: Add Mac workaround to tst_revert_changes

If the editor had not been clicked before invoking the
Edit menu Creator does not notice that the editor has focus,
so all subitems will be grayed out.

Change-Id: If8b23fd6abae1bac6b3387e9a5394cfb4b84529d
Reviewed-by: Robert Loehning <robert.loehning@digia.com>

tests/system/suite_editors/tst_revert_changes/test.py

@@ -62,6 +62,8 @@ def __modifyProFile__():
 # re-order some stuff inside header
 def __modifyHeader__():
     global cppEditorStr, homeShortCut, endShortCut
+    if platform.system() == "Darwin":
+        JIRA.performWorkaroundIfStillOpen(6918, JIRA.Bug.CREATOR, waitForObject(cppEditorStr, 1000))
     if placeCursorToLine(cppEditorStr, "class.+", True):
         type(cppEditorStr, homeShortCut)
         markText(cppEditorStr, "Down", 5)