Do not add HOTSEAT_ICONS to visible elements for device type "phone" in
ALL_APPS State

HOTSEAT_ICONS got added to visible elements for ALL_APPS State in ag/16992837.

============================================================
Phone
Before:
HotSeat present in view hierarchy - https://hsv.googleplex.com/4906040983289856?node=41
Video: https://b.corp.google.com/issues/228803923#comment9

After:
HotSeat not present in view hierarchy - https://hsv.googleplex.com/5379653922455552?node=42
Video: https://b.corp.google.com/issues/228803923#comment11
============================================================

Tablets

I couldn't test this implementation on tablet. But I have verified on a phone
locally by adding HOTSEAT_ICONS to visible elements and then verifying
"IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS" get set and hotseat icons are not focusable in all apps.
Video : https://b.corp.google.com/issues/228803923#comment14

============================================================

Bug: 228803923
Bug: 227565451

Test: Manual. See the video attached in bug.
Change-Id: I055e3bb61c8cfd240e0fe1000fe3a391a150f6d1
diff --git a/src/com/android/launcher3/LauncherState.java b/src/com/android/launcher3/LauncherState.java
index baee49f..c0bcaa3 100644
--- a/src/com/android/launcher3/LauncherState.java
+++ b/src/com/android/launcher3/LauncherState.java
@@ -80,6 +80,9 @@
     public static final int FLAG_CLOSE_POPUPS = BaseState.getFlag(6);
     public static final int FLAG_OVERVIEW_UI = BaseState.getFlag(7);
 
+    // Flag indicating that hotseat and its contents are not accessible.
+    public static final int FLAG_HOTSEAT_INACCESSIBLE = BaseState.getFlag(8);
+
 
     public static final float NO_OFFSET = 0;
     public static final float NO_SCALE = 1;
diff --git a/src/com/android/launcher3/WorkspaceStateTransitionAnimation.java b/src/com/android/launcher3/WorkspaceStateTransitionAnimation.java
index 84b95ec..bf56ac0 100644
--- a/src/com/android/launcher3/WorkspaceStateTransitionAnimation.java
+++ b/src/com/android/launcher3/WorkspaceStateTransitionAnimation.java
@@ -25,6 +25,7 @@
 import static com.android.launcher3.LauncherAnimUtils.VIEW_TRANSLATE_Y;
 import static com.android.launcher3.LauncherAnimUtils.WORKSPACE_SCALE_PROPERTY_FACTORY;
 import static com.android.launcher3.LauncherState.FLAG_HAS_SYS_UI_SCRIM;
+import static com.android.launcher3.LauncherState.FLAG_HOTSEAT_INACCESSIBLE;
 import static com.android.launcher3.LauncherState.HINT_STATE;
 import static com.android.launcher3.LauncherState.HOTSEAT_ICONS;
 import static com.android.launcher3.LauncherState.NORMAL;
@@ -151,6 +152,12 @@
         propertySetter.setViewAlpha(mLauncher.getWorkspace().getPageIndicator(),
                 workspacePageIndicatorAlpha, fadeInterpolator);
 
+        // Update the accessibility flags for hotseat based on launcher state.
+        hotseat.setImportantForAccessibility(
+                state.hasFlag(FLAG_HOTSEAT_INACCESSIBLE)
+                        ? View.IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS
+                        : View.IMPORTANT_FOR_ACCESSIBILITY_AUTO);
+
         Interpolator translationInterpolator =
                 config.getInterpolator(ANIM_WORKSPACE_TRANSLATE, ZOOM_OUT);
         propertySetter.setFloat(mWorkspace, VIEW_TRANSLATE_X,