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for implementing tool tips

gtk

• https://developer.gnome.org/gtk3/stable/GtkWidget.html#gtk-widget-set-tooltip-text
• this was straightforward

mac osx

• https://developer.apple.com/library/mac/documentation/Cocoa/Reference/ApplicationKit/Classes/NSView_Class/#//apple_ref/occ/instp/NSView/toolTip
• will be slightly trickier, as the cocoa objects corresponding to the menu-item%s aren't created at the same time as the menu-item%, so the tooltip has to be saved and applied when the cocoa object is.

win32

• https://msdn.microsoft.com/en-us/library/windows/desktop/hh298368(v=vs.85).aspx
• control tooltips involve creating a whole extra window, and setting properties on it
• menu item tooltips seem to be completely nonexistant, and may require a lot of in-racket work.