Add method for adding expansion listener without firing event

The current method immediately sends a change event to the listener,
which causes the AuthDialogPanelInteractionDetector dialog to
immediately cancel itself upon adding the listener. Adding a new
method that doesn't fire the event and calling that instead fixes
the problem.

Test: manually verified
Test: atest SystemUITests SystemUIGoogleTests
Fixes: 278455611
Change-Id: Id94bba0ab10890fd3c380d69cf6409c614c7e84c

packages/SystemUI/src/com/android/systemui/biometrics/AuthDialogPanelInteractionDetector.kt

@@ -21,7 +21,7 @@ constructor(
     fun enable(onPanelInteraction: Runnable) {
         if (action == null) {
             action = Action(onPanelInteraction)
-            shadeExpansionStateManager.addExpansionListener(this::onPanelExpansionChanged)
+            shadeExpansionStateManager.addShadeExpansionListener(this::onPanelExpansionChanged)
         } else {
             Log.e(TAG, "Already enabled")
         }

packages/SystemUI/src/com/android/systemui/shade/ShadeExpansionStateManager.kt

@@ -54,12 +54,20 @@ class ShadeExpansionStateManager @Inject constructor() : ShadeStateEvents {
      * Listener will also be immediately notified with the current values.
      */
     fun addExpansionListener(listener: ShadeExpansionListener) {
-        expansionListeners.add(listener)
+        addShadeExpansionListener(listener)
         listener.onPanelExpansionChanged(
             ShadeExpansionChangeEvent(fraction, expanded, tracking, dragDownPxAmount)
         )
     }
 
+    /**
+     * Adds a listener that will be notified when the panel expansion fraction has changed.
+     * @see #addExpansionListener
+     */
+    fun addShadeExpansionListener(listener: ShadeExpansionListener) {
+        expansionListeners.add(listener)
+    }
+
     /** Removes an expansion listener. */
     fun removeExpansionListener(listener: ShadeExpansionListener) {
         expansionListeners.remove(listener)