Simplify mouse-dragging implementation.
Now that DEL deletes active regions, we can handle it by using the ordinary region instead of a separate overlay. * mouse.el (mouse-drag-overlay): Variable deleted. (mouse-move-drag-overlay, mouse-show-mark): Functions deleted. (mouse--remap-link-click-p): New function. (mouse-drag-track): Handle dragging by using temporary Transient Mark mode, instead of a special overlay. (mouse-kill-ring-save, mouse-save-then-kill): Don't call mouse-show-mark. * mouse-sel.el (mouse-sel-selection-alist): mouse-drag-overlay deleted.
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