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
(cherry picked from commit cf313aaaad8a76b2b8ae55d54f1753268c1d3dc3)
diff --git a/packages/SystemUI/src/com/android/systemui/globalactions/GlobalActionsDialog.java b/packages/SystemUI/src/com/android/systemui/globalactions/GlobalActionsDialog.java
index 3226605..910a7e3 100644
--- a/packages/SystemUI/src/com/android/systemui/globalactions/GlobalActionsDialog.java
+++ b/packages/SystemUI/src/com/android/systemui/globalactions/GlobalActionsDialog.java
@@ -479,7 +479,8 @@
      */
     @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;