newsticker: Context menu in treeview's tree.
* net/newst-treeview.el (newsticker--treeview-list-add-item) (newsticker--treeview-propertize-tag): Bind tree menu to mouse-3. (newsticker--treeview-create-groups-menu) (newsticker--treeview-create-tree-menu): Removed. (newsticker--treeview-tree-open-menu): New. (newsticker-treeview-tree-click): Pass event to `newsticker-treeview-tree-do-click'. (newsticker-treeview-tree-do-click): Open treemenu on mouse-3.
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