[CollapsingToolbarLayout] Fix jumping when multiline title changes while collapsed

When a multiline title changes length (e.g. multi-line to single-line) while collapsed, the layout height decreases. If the previous scroll offset is deeper than the new valid range, the AppBarLayout can jump or get stuck in an invalid state.

This fix forces the AppBarLayout to `PENDING_ACTION_COLLAPSED` if the CollapsingToolbarLayout height changes while fully collapsed. This ensures it snaps correctly to the new collapsed offset.

PiperOrigin-RevId: 861133526

Author: Material Design Team

lib/java/com/google/android/material/appbar/CollapsingToolbarLayout.java

@@ -545,18 +545,22 @@ protected void onConfigurationChanged(@NonNull Configuration newConfig) {
     if (screenOrientation != newConfig.orientation
         && extraMultilineHeightEnabled
         && collapsingTitleHelper.getExpansionFraction() == 1f) {
-      ViewParent parent = getParent();
-      if (parent instanceof AppBarLayout) {
-        AppBarLayout appBarLayout = (AppBarLayout) parent;
-        if (appBarLayout.getPendingAction() == AppBarLayout.PENDING_ACTION_NONE) {
-          appBarLayout.setPendingAction(AppBarLayout.PENDING_ACTION_COLLAPSED);
-        }
-      }
+      maybeSetPendingActionCollapsed();
     }
 
     screenOrientation = newConfig.orientation;
   }
 
+  private void maybeSetPendingActionCollapsed() {
+    ViewParent parent = getParent();
+    if (parent instanceof AppBarLayout) {
+      AppBarLayout appBarLayout = (AppBarLayout) parent;
+      if (appBarLayout.getPendingAction() == AppBarLayout.PENDING_ACTION_NONE) {
+        appBarLayout.setPendingAction(AppBarLayout.PENDING_ACTION_COLLAPSED);
+      }
+    }
+  }
+
   @Override
   protected boolean drawChild(Canvas canvas, View child, long drawingTime) {
     // This is a little weird. Our scrim needs to be behind the Toolbar (if it is present),
@@ -771,6 +775,16 @@ protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
         setMinimumHeight(getHeightWithMargins(toolbarDirectChild));
       }
     }
+
+    // When extra multiline height is enabled, the height of the CollapsingToolbarLayout can change
+    // dynamically. If the height changes while the view is collapsed, we need to ensure that the
+    // AppBarLayout updates its collapse state to match the new height, otherwise it may try to
+    // scroll to an invalid offset based on the old height.
+    if (extraMultilineHeightEnabled
+        && collapsingTitleHelper.getExpandedMaxLines() > 1
+        && collapsingTitleHelper.getExpansionFraction() == 1f) {
+      maybeSetPendingActionCollapsed();
+    }
   }
 
   @Override