Update test scripts to find sources in categories.

tests/xml/LoadDistributedPlugins.xml

@@ -13,7 +13,7 @@
   <pqevent object="pqClientMainWindow/menubar/menu_Catalyst" command="activate" arguments="Export State" />
   <pqevent object="pqClientMainWindow/ExportStateWizard" command="key" arguments="16777216" />
   <pqevent object="pqClientMainWindow/menubar" command="activate" arguments="menuSources" />
-  <pqevent object="pqClientMainWindow/menubar/menuSources" command="activate" arguments="SphereSource" />
+  <pqevent object="pqClientMainWindow/menubar/menuSources/Alphabetical" command="activate" arguments="SphereSource" />
   <pqevent object="pqClientMainWindow/propertiesDock/propertiesPanel/Accept" command="activate" arguments="" />
   <pqevent object="pqClientMainWindow/menubar" command="activate" arguments="menuFilters" />
   <pqevent object="pqClientMainWindow/menubar/menuFilters/Alphabetical" command="activate" arguments="PolyDataNormals" />

tests/xml/OSPRay.xml

 <?xml version="1.0" ?>
 <pqevents>
   <pqevent object="pqClientMainWindow/menubar" command="activate" arguments="menuSources" />
-  <pqevent object="pqClientMainWindow/menubar/menuSources" command="activate" arguments="SphereSource" />
+  <pqevent object="pqClientMainWindow/menubar/menuSources/Alphabetical" command="activate" arguments="SphereSource" />
   <pqevent object="pqClientMainWindow/propertiesDock/propertiesPanel/Accept" command="activate" arguments="" />
   <pqevent object="pqClientMainWindow/propertiesDock/propertiesPanel/scrollArea/qt_scrollarea_vcontainer/1QScrollBar0" command="mousePress" arguments="1,1,0,7,77" />
   <pqevent object="pqClientMainWindow/propertiesDock/propertiesPanel/scrollArea/qt_scrollarea_vcontainer/1QScrollBar0" command="mouseMove" arguments="1,0,0,-6,511" />

tests/xml/TestFindData.xml

 <?xml version="1.0" ?>
 <pqevents>
-  <pqevent object="pqClientMainWindow/menubar/menuSources" command="activate" arguments="RTAnalyticSource" />
+  <pqevent object="pqClientMainWindow/menubar/menuSources/Alphabetical" command="activate" arguments="RTAnalyticSource" />
   <pqevent object="pqClientMainWindow/propertiesDock/propertiesPanel/Accept" command="activate" arguments="" />
 
   <pqevent object="pqClientMainWindow/menubar/menu_Edit" command="activate" arguments="actionQuery" />

tests/xml/TestMatplotlib.xml

 <?xml version="1.0" ?>
 <pqevents>
   <pqevent object="pqClientMainWindow/menubar" command="activate" arguments="menuSources" />
-  <pqevent object="pqClientMainWindow/menubar/menuSources" command="activate" arguments="TextSource" />
+  <pqevent object="pqClientMainWindow/menubar/menuSources/Alphabetical" command="activate" arguments="TextSource" />
   <pqevent object="pqClientMainWindow/propertiesDock/propertiesPanel/scrollArea/qt_scrollarea_viewport/scrollAreaWidgetContents/PropertiesFrame/ProxyPanel/Text/Text" command="set_string"
            arguments="$\sum_{i=0}^\infty x_i * \frac{3}{4} \binom{3}{4} \stackrel{3}{4} * \sqrt[3]{x}$" />
   <pqevent object="pqClientMainWindow/propertiesDock/propertiesPanel/Accept" command="activate" arguments="" />

tests/xml/TestUI.xml

@@ -14,7 +14,7 @@
   <pqevent object="pqClientMainWindow/PluginManagerDialog/buttonBox/1QPushButton0" command="activate" arguments="" />
 
   <pqevent object="pqClientMainWindow/menubar" command="activate" arguments="menuSources" />
-  <pqevent object="pqClientMainWindow/menubar/menuSources" command="activate" arguments="SphereSource" />
+  <pqevent object="pqClientMainWindow/menubar/menuSources/Alphabetical" command="activate" arguments="SphereSource" />
   <pqevent object="pqClientMainWindow/propertiesDock/propertiesPanel/Accept" command="activate" arguments="" />
   <pqevent object="pqClientMainWindow/propertiesDock/propertiesPanel/Help" command="activate" arguments="" />
 

tests/xml/VTKmContour.xml

 <?xml version="1.0" ?>
 <pqevents>
   <pqevent object="pqClientMainWindow/menubar" command="activate" arguments="menuSources" />
-  <pqevent object="pqClientMainWindow/menubar/menuSources" command="activate" arguments="RTAnalyticSource" />
+  <pqevent object="pqClientMainWindow/menubar/menuSources/Alphabetical" command="activate" arguments="RTAnalyticSource" />
   <pqevent object="pqClientMainWindow/propertiesDock/propertiesPanel/Accept" command="activate" arguments="" />
   <pqevent object="pqClientMainWindow/menubar" command="activate" arguments="menuFilters" />
   <pqevent object="pqClientMainWindow/menubar/menuFilters/VTKm" command="activate" arguments="VTKmContour" />

tests/xml/VTKmGradient.xml

 <?xml version="1.0" ?>
 <pqevents>
   <pqevent object="pqClientMainWindow/menubar" command="activate" arguments="menuSources" />
-  <pqevent object="pqClientMainWindow/menubar/menuSources" command="activate" arguments="RTAnalyticSource" />
+  <pqevent object="pqClientMainWindow/menubar/menuSources/Alphabetical" command="activate" arguments="RTAnalyticSource" />
   <pqevent object="pqClientMainWindow/1QTabBar0" command="set_tab_with_text" arguments="Properties" />
   <pqevent object="pqClientMainWindow/propertiesDock/propertiesPanel/Accept" command="activate" arguments="" />
   <pqevent object="pqClientMainWindow/menubar" command="activate" arguments="menuFilters" />

tests/xml/VTKmThreshold.xml

@@ -3,7 +3,7 @@
   <pqevent object="pqClientMainWindow/pipelineBrowserDock/pipelineBrowser" command="mousePress" arguments="1,1,0,194,108," />
   <pqevent object="pqClientMainWindow/pipelineBrowserDock/pipelineBrowser" command="mouseRelease" arguments="1,0,0,194,108," />
   <pqevent object="pqClientMainWindow/menubar" command="activate" arguments="menuSources" />
-  <pqevent object="pqClientMainWindow/menubar/menuSources" command="activate" arguments="RTAnalyticSource" />
+  <pqevent object="pqClientMainWindow/menubar/menuSources/Alphabetical" command="activate" arguments="RTAnalyticSource" />
   <pqevent object="pqClientMainWindow/1QTabBar2" command="set_tab_with_text" arguments="Properties" />
   <pqevent object="pqClientMainWindow/propertiesDock/propertiesPanel/Accept" command="activate" arguments="" />
   <pqevent object="pqClientMainWindow/menubar" command="activate" arguments="menuFilters" />