Separate mouse-1-click-follows-link from mouse-drag-region.
* lisp/mouse.el (mouse--down-1-maybe-follows-link): New function. (key-translation-map): Use it to implement mouse-1-click-follows-link. (mouse-drag-line, mouse-drag-track): Remove mouse-1-click-follows-link code. (mouse--remap-link-click-p): Remove. * src/keyboard.c (access_keymap_keyremap): Accept nil return value from functions to mean "no change". * src/keyboard.h (EVENT_START, EVENT_END, POSN_WINDOW, POSN_POSN) (POSN_WINDOW_POSN, POSN_TIMESTAMP): Be careful since events may come from Elisp via unread-command-events.
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