1 files changed, 1 insertions, 0 deletions
diff --git a/services/core/java/com/android/server/wm/DisplayContent.java b/services/core/java/com/android/server/wm/DisplayContent.java
index f914369..5d6df26 100644
--- a/services/core/java/com/android/server/wm/DisplayContent.java
+++ b/services/core/java/com/android/server/wm/DisplayContent.java
@@ -238,6 +238,7 @@ class DisplayContent {
             final TaskStack stack = win.getStack();
             if (win.isVisibleLw() && stack != null && stack != focusedStack) {
                 mTmpRect.set(win.mVisibleFrame);
+                // If no intersection, we need mTmpRect to be unmodified.
                 mTmpRect.intersect(win.mVisibleInsets);
                 mTouchExcludeRegion.op(mTmpRect, Region.Op.DIFFERENCE);
             }