Update copyright notice to reflect assignment to FSF and incorporation
into Emacs. Attempt to load `timer'. (eldoc-idle-delay): Make defconst. (eldoc-minor-mode-string): Make defconst. (eldoc-argument-case): Make defconst. (eldoc-message-commands): Renamed from eldoc-mode-message-commands. All callers changed. Add `mouse-set-point' as a default candidate. (eldoc-use-idle-timer-p): New constant. (eldoc-timer): New variable. (eldoc-current-idle-delay): New variable. (eldoc-schedule-timer): New function. (eldoc-mode): Use idle timers if supported. (eldoc-add-command): Provide completion on interactive commands only, not all bound functions. (eldoc-print-current-symbol-info): Renamed from eldoc-mode-print-current-symbol-info. All callers changed. Check whether using idle timers or being run from post-command hooks. Use `executing-kbd-macro' instead of `executing-macro'. (eldoc-print-fnsym-args): Don't make interactive. Cache current symbol name in eldoc-last-data; it was forgetting to do this previously. If subr args cannot be determined, show single-line docstring for it instead. (eldoc-docstring-message): New function. (eldoc-print-docstring): New function. (eldoc-print-var-docstring): Use them. (eldoc-function-argstring-from-docstring-method-table): New constant. (eldoc-function-argstring-from-docstring): Use it.
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