Squish: catch plugin loader error if it occurs

...and stop execution of the current test case

Change-Id: I46ac21e79f643f6890b7303d08c204dcd9fa9386
Reviewed-by: Robert Loehning <robert.loehning@digia.com>

tests/system/shared/qtcreator.py

@@ -42,6 +42,21 @@ def overrideStartApplication():
             test.log("Using workaround for MacOS (different AUT name)")
         return __origStartApplication__(*args)
 
+def startedWithoutPluginError():
+    try:
+        loaderErrorWidgetName = ("{name='ExtensionSystem__Internal__PluginErrorOverview' "
+                                 "type='ExtensionSystem::PluginErrorOverview' visible='1' "
+                                 "windowTitle='Qt Creator - Plugin loader messages'}")
+        loaderError = waitForObject(loaderErrorWidgetName, 1000)
+        test.fatal("Could not perform clean start of Qt Creator - Plugin error occurred.",
+                   waitForObject("{name='pluginError' type='QTextEdit' visible='1' window=%s}"
+                                 % loaderErrorWidgetName, 1000).plainText)
+        clickButton("{text~='(Next.*|Continue)' type='QPushButton' visible='1'}")
+        invokeMenuItem("File", "Exit")
+        return False
+    except:
+        return True
+
 def waitForCleanShutdown(timeOut=10):
     appCtxt = currentApplicationContext()
     shutdownDone = (str(appCtxt)=="")