Ignacio 2b564f504b Better check for when clipboard or primary selection have changed ...

Previously it was done by just comparing new and old selection
text, now we use also selection timestamps for systems that
support it (only enabled in X for now).  (bug#53894)

* lisp/select.el: (gui--last-selection-timestamp-clipboard)
(gui--last-selection-timestamp-primary): New variables.

(gui--set-last-clipboard-selection)
(gui--set-last-primary-selection)
(gui--clipboard-selection-unchanged-p)
(gui--primary-selection-unchanged-p): New functions.

2022-04-01 20:57:54 +08:00

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