systray: show a the context menu upon press an hold on the icon

Summary: This way we can open the context menu from touch

Test Plan: Tapped and hold on my screen

Reviewers: #plasma, ngraham

Reviewed By: ngraham

Subscribers: plasma-devel

Tags: #plasma

Differential Revision: https://phabricator.kde.org/D19946

applets/systemtray/package/contents/ui/items/AbstractItem.qml

@@ -112,6 +112,9 @@ PlasmaCore.ToolTipArea {
                 abstractItem.contextMenu(mouse)
             }
         }
+        onPressAndHold: {
+            abstractItem.contextMenu(mouse)
+        }
         onWheel: {
             abstractItem.wheel(wheel);
             //Don't accept the event in order to make the scrolling by mouse wheel working

applets/systemtray/package/contents/ui/items/StatusNotifierItem.qml

@@ -59,6 +59,10 @@ AbstractItem {
         }
     }
 
+    onContextMenu: {
+        openContextMenu(plasmoid.nativeInterface.popupPosition(taskIcon, mouse.x, mouse.y))
+    }
+
     onClicked: {
         var pos = plasmoid.nativeInterface.popupPosition(taskIcon, mouse.x, mouse.y);