Squish: Store text of item as early as possible

It seems that item.text can change after (not during!) the
double-click. Storing it earlier to workaround this problem.

Change-Id: I5da4ae7ea8e19b945e56349c2236940a9e5731cb
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

tests/system/shared/editor_utils.py

@@ -380,13 +380,13 @@ def openDocument(treeElement):
         except:
             treeElement = addBranchWildcardToRoot(treeElement)
             item = waitForObjectItem(navigator, treeElement)
+        expected = str(item.text).split("/")[-1]
         for _ in range(2):
             # Expands items as needed what might make scrollbars appear.
             # These might cover the item to click.
             # In this case, do it again to hit the item then.
             doubleClickItem(navigator, treeElement, 5, 5, 0, Qt.LeftButton)
             mainWindow = waitForObject(":Qt Creator_Core::Internal::MainWindow")
-            expected = str(item.text).split("/")[-1]
             if waitFor("str(mainWindow.windowTitle).startswith(expected + ' ')", 5000):
                 return True
         test.log("Expected file (%s) was not being opened in openDocument()" % expected)