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a50da0e309
Rather than trying to get my existing hugely complicated X-style clipboard code to somehow work with the Quartz GTK back end, I've written an entirely new and much simpler alternative clipboard handler usnig the higher-leve GtkClipboard interface. It assumes all clipboard text can be converted to and from UTF-8 sensibly (which isn't a good assumption on all front ends, but on OS X I think it's reasonable), and it talks to GDK_SELECTION_CLIPBOARD rather than PRIMARY, which is the only clipboard OS X has. I had to do a fiddly thing to cope with the fact that each call to gtk_clipboard_set_with_data caused a call to the clipboard clear function left over from the previous set of data, so I had to avoid mistaking that for a clipboard-clear for the _new_ data and immediately deselecting it. I did that by allocating a distinct placeholder object in memory for each instance of the copy operation, so that I can tell whether a clipboard-clear is for the current copy or a previous one. This is only very basic support which demonstrates successful copying and pasting is at least possible. For a sensible OS X implementation we'll need a more believable means of generating a paste UI action (it's quite easy to find a Mac on which neither Shift-Ins nor the third mouse button even exists!). Also, after the trouble I had with the clipboard-clear event, it's a bit annoying to find that it _doesn't_ seem to get called when another application becomes the clipboard owner. That may just be something we have to put up with, if I can't find any reason why it's failing.