Mutate gravity horizontal value on setExpandedTextGravity and setCollapsedTextGravity, so the code can assume they are set.

PiperOrigin-RevId: 286392235

Author: johan12345

lib/java/com/google/android/material/internal/CollapsingTextHelper.java

@@ -272,6 +272,9 @@ void onBoundsChanged() {
   }
 
   public void setExpandedTextGravity(int gravity) {
+    if ((gravity & GravityCompat.RELATIVE_HORIZONTAL_GRAVITY_MASK) == 0) {
+      gravity |= GravityCompat.START;
+    }
     if (expandedTextGravity != gravity) {
       expandedTextGravity = gravity;
       recalculate();
@@ -283,6 +286,9 @@ public int getExpandedTextGravity() {
   }
 
   public void setCollapsedTextGravity(int gravity) {
+    if ((gravity & GravityCompat.RELATIVE_HORIZONTAL_GRAVITY_MASK) == 0) {
+      gravity |= GravityCompat.START;
+    }
     if (collapsedTextGravity != gravity) {
       collapsedTextGravity = gravity;
       recalculate();