The sidebar menus (folder tree, view options) and the page menus (card,
bulk selection, page-global) are independent components that only knew
how to close themselves, so right-clicking a folder left an open card
menu next to the folder menu, and right-clicking a card left the folder
menu behind.
Add a coordinator where every menu registers a closer; opening a menu
first closes all the others. BaseContextMenu takes part automatically,
the sidebar registers its two menus, and the global contextmenu handler
now uses the coordinator instead of hiding three specific menus by hand
(which also covers right-clicks outside the content area).
Will Miao
91f955a277