Disable overflow menu on lock screen.

Test: Manual -- overflow menu does not appear when power menu launched from keyguard. All items appear in one row.

Fixes: 154441764
Change-Id: I5430b08749603e9d4fcbbbedeeb9644966235d1d

packages/SystemUI/src/com/android/systemui/globalactions/GlobalActionsDialog.java

@@ -479,7 +479,8 @@ public class GlobalActionsDialog implements DialogInterface.OnDismissListener,
      */
     @VisibleForTesting
     protected int getMaxShownPowerItems() {
-        if (shouldUseControlsLayout()) {
+        // TODO: Overflow disabled on keyguard while we solve for touch blocking issues.
+        if (shouldUseControlsLayout() && !mKeyguardShowing) {
             return mResources.getInteger(com.android.systemui.R.integer.power_menu_max_columns);
         } else {
             return Integer.MAX_VALUE;