SF: More frontend fixes

- Crop mirrored layers with the mirror root. Previously we were
 cropping the layers with the original layer and not the clone.
- Explicitly make unreachable nodes invisible. Fixes an issue where
we accessed stale snapshots that were no longer reachable.
- Update buffer geometry (inverseTransformDisplay) when display state
changes.
- Blur fixes.

Test: presubmit
Bug: 238781169

Change-Id: I6f88f2456c3fd15c9d819ec2272aee639badcd19
diff --git a/services/surfaceflinger/FrontEnd/LayerSnapshotBuilder.h b/services/surfaceflinger/FrontEnd/LayerSnapshotBuilder.h
index f4544fd..0902ab8 100644
--- a/services/surfaceflinger/FrontEnd/LayerSnapshotBuilder.h
+++ b/services/surfaceflinger/FrontEnd/LayerSnapshotBuilder.h
@@ -115,8 +115,8 @@
     struct TraversalPathHash {
         std::size_t operator()(const LayerHierarchy::TraversalPath& key) const {
             uint32_t hashCode = key.id * 31;
-            for (auto mirrorRoot : key.mirrorRootIds) {
-                hashCode += mirrorRoot * 31;
+            if (key.mirrorRootId != UNASSIGNED_LAYER_ID) {
+                hashCode += key.mirrorRootId * 31;
             }
             return std::hash<size_t>{}(hashCode);
         }