* lisp/mouse.el: Use the normal toplevel loop while dragging.

* lisp/mouse.el: Use the normal toplevel loop while dragging.
(mouse-set-point): Handle multi-clicks.
(mouse-set-region): Handle multi-clicks for drags.
(mouse-drag-region): Update call accordingly.
(mouse-drag-track): Remove `do-mouse-drag-region-post-process' hack.
Use the normal event loop instead of a local while/read-event loop.
(global-map): Remove redundant bindings for double/triple-mouse-1.
* lisp/xt-mouse.el (xterm-mouse-translate-1): Only process one event at a time.
Generate synthetic down events when the protocol only sends up events.
(xterm-mouse-last): Remove.
(xterm-mouse--read-event-sequence-1000): Use xterm-mouse-last-down
terminal parameter instead.
(xterm-mouse--set-click-count): New function.
(xterm-mouse-event): Detect/generate double/triple clicks.
* lisp/reveal.el (reveal-close-old-overlays): Don't close while dragging.