Hell of a speed boost for Steam.

src/cthulhu/scripts/apps/steamwebhelper/script.py

@@ -118,8 +118,19 @@ class Script(Chromium.Script):
             self._presentSteamNotification(event.any_data)
             return
 
+        if self._handleSteamVirtualizedListMutation(event):
+            return True
+
         super().onChildrenAdded(event)
 
+    def onChildrenRemoved(self, event):
+        """Callback for object:children-changed:removed accessibility events."""
+
+        if self._handleSteamVirtualizedListMutation(event):
+            return True
+
+        return super().onChildrenRemoved(event)
+
     def getStructuralNavigation(self):
         types = self.getEnabledStructuralNavigationTypes()
         enable = settingsManager.getSetting('structuralNavigationEnabled')
@@ -165,6 +176,23 @@ class Script(Chromium.Script):
         self._logSteamNavigationEvent("active-descendant-changed", event)
         return super().onActiveDescendantChanged(event)
 
+    def _handleSteamVirtualizedListMutation(self, event):
+        if not event or not self.utilities.isSteamVirtualizedList(event.source):
+            return False
+
+        focus = cthulhu_state.locusOfFocus
+        if not focus or AXObject.is_dead(focus):
+            return False
+
+        if not AXObject.find_ancestor(focus, lambda x: x == event.source):
+            return False
+
+        AXObject.clear_cache_now("children-changed event.")
+        self.utilities.clearSteamVirtualizedListCaches()
+        msg = "STEAM: Skipping generic web cache dump for virtualized list churn near focus"
+        debug.printMessage(debug.LEVEL_INFO, msg, True)
+        return True
+
     def _trySteamButtonActivation(self, keyboardEvent) -> bool:
         if keyboardEvent.event_string not in ["Return", "KP_Enter"]:
             return False

src/cthulhu/scripts/apps/steamwebhelper/script_utilities.py

@@ -41,6 +41,20 @@ class Utilities(ChromiumUtilities):
         super().clearCachedObjects()
         self._steamInferredButtonLabels = {}
 
+    def clearSteamVirtualizedListCaches(self) -> None:
+        self.clearContentCache()
+        self._steamInferredButtonLabels = {}
+
+    def isSteamVirtualizedList(self, obj) -> bool:
+        if not (obj and self.inDocumentContent(obj)):
+            return False
+
+        if not AXUtilities.is_list(obj):
+            return False
+
+        className = AXObject.get_attribute(obj, "class") or ""
+        return "ReactVirtualized__Grid__innerScrollContainer" in className
+
     def displayedLabel(self, obj):
         label = super().displayedLabel(obj)
         if label or not self._shouldInferSteamButtonLabel(obj):