Open taskbar pinning popup view from anywhere

This CL handles both long-press and right-click events anywhere on
pinned taskbar and opens `TaskbarDividerPopupView` correctly
positioning it above the event coordinates.

Bug: 297325541
Flag: com.android.launcher3.show_taskbar_pinning_popup_from_anywhere
Test: manual for now, flip the flag, long-click or right-click
      on empty space on the pinned taskbar
Change-Id: I1849db14f65bf9478ed9f4fd39f95d08987baf8d
diff --git a/aconfig/launcher.aconfig b/aconfig/launcher.aconfig
index aafa1f6..ffde0d1 100644
--- a/aconfig/launcher.aconfig
+++ b/aconfig/launcher.aconfig
@@ -471,3 +471,10 @@
     description: "Shows filtered set of widgets by default and an option to show all widgets in the widget picker"
     bug: "356127021"
 }
+
+flag {
+    name: "show_taskbar_pinning_popup_from_anywhere"
+    namespace: "launcher"
+    description: "Shows the pinning popup view after long-pressing or right-clicking anywhere on the pinned taskbar"
+    bug: "297325541"
+}