Improve app pairs disabled state

This CL fixes 2 issues with app pairs:
- When an app pair is incompatible with the screen size due to a non-resizeable app (e.g. Camera), the app pair will now be properly disabled and display an error message. If the user is on a foldable, it will prompt the user to unfold their phone.
- The app pair icon will now properly redraw with lower opacity when it is disabled.

Fixes: 323088270
Test: Manually paused and unpaused apps, created Camera app pairs and tested with foldable
Flag: ACONFIG com.android.wm.shell.enable_app_pairs TEAMFOOD
Change-Id: I66514c96bc19f480c9788661e4dffaa5b1cdc2ca

src/com/android/launcher3/touch/ItemClickHandler.java

@@ -41,6 +41,7 @@ import android.widget.Toast;
 
 import com.android.launcher3.BubbleTextView;
 import com.android.launcher3.BuildConfig;
+import com.android.launcher3.InvariantDeviceProfile;
 import com.android.launcher3.Launcher;
 import com.android.launcher3.LauncherSettings;
 import com.android.launcher3.R;
@@ -149,7 +150,15 @@ public class ItemClickHandler {
     private static void onClickAppPairIcon(View v) {
         Launcher launcher = Launcher.getLauncher(v.getContext());
         AppPairIcon appPairIcon = (AppPairIcon) v;
-        if (appPairIcon.getInfo().isDisabled()) {
+        if (!appPairIcon.isLaunchableAtScreenSize()) {
+            // Display a message for app pairs that are disabled due to screen size
+            boolean isFoldable = InvariantDeviceProfile.INSTANCE.get(launcher)
+                    .supportedProfiles.stream().anyMatch(dp -> dp.isTwoPanels);
+            Toast.makeText(launcher, isFoldable
+                            ? R.string.app_pair_needs_unfold
+                            : R.string.app_pair_unlaunchable_at_screen_size,
+                    Toast.LENGTH_SHORT).show();
+        } else if (appPairIcon.getInfo().isDisabled()) {
             WorkspaceItemInfo app1 = appPairIcon.getInfo().contents.get(0);
             WorkspaceItemInfo app2 = appPairIcon.getInfo().contents.get(1);
             // Show the user why the app pair is disabled.