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As per #2166, this adds append to playlist functionality through a modified drag and drop.
I have started with just x11. In this PR all other platforms preserve the existing "replace" behaviour for now.
The only way I could find to achieve this is to use the Action member in the XdndPosition client message. This is typically XdndActionCopy, however Thunar, Nautilus and Dolphin change this to XdndActionMove if you press the shift key. Dolphin will additionally send XdndActionLink if you press alt. Therefore, XdndActionCopy corresponds to the existing "replace" behaviour, while anything else is considered "append".
This seems kind of hackish to me, but I can't figure out any way to determine the modifier keys at drop time directly since the mpv window does not have focus and none of the above file managers appear to send this information along in the XdndPosition as they are supposed to according to http://jjlindal.net/jafl/xdnd/.