* lisp/follow.el: Rework, eliminating reliance on advice.
(set-process-filter, process-filter, sit-for): Advice deleted. (follow-mode-off-hook): Obsolete hook removed. (follow-avoid-tail-recenter-p, follow-process-filter-alist): Vars deleted. (follow-auto): Use a :set function. (follow-mode): Rewritten. Don't advise process filters. (follow-switch-to-current-buffer-all, follow-scroll-up) (follow-scroll-down): Assume follow-mode is bound. (follow-comint-scroll-to-bottom) (follow-align-compilation-windows): New functions. (follow--window-sorter): New function. (follow-all-followers): Use it to explicitly sort windows by their positions; don't make assumptions about next-window order. (follow-windows-start-end, follow-delete-other-windows-and-split) (follow-calc-win-start): Doc fix. (follow-windows-aligned-p, follow-select-if-visible): Don't call vertical-motion unnecessarily. (follow-adjust-window): New function. (follow-post-command-hook): Use it. (follow-call-set-process-filter, follow-call-process-filter) (follow-intercept-process-output, follow-tidy-process-filter-alist) (follow-stop-intercept-process-output, follow-generic-filter): Functions deleted. (follow-scroll-bar-toolkit-scroll, follow-scroll-bar-drag) (follow-scroll-bar-scroll-up, follow-scroll-bar-scroll-down): New functions, replacing advice on scroll-bar-* commands. * lisp/comint.el (comint-adjust-point): New function. (comint-postoutput-scroll-to-bottom): Use it. Call follow-comint-scroll-to-bottom for Follow mode buffers.
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