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Since commit c255031b we pass scroll-events through to the compositor if the window_grab_modifiers are pressed; in order to allow gnome-shell to check for those events, expose the struct member as a MetaDisplay property. Also take the opportunity to pick a more generic name, now that the modifier is no longer used exclusively for mouse clicks (unless we maintain the notion of scroll events as button 4 and 5 "clicks"). Part-of: <!1695>
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