Add the `scroll-command' property.
* window.c: Add Qscroll_command. Remove Vscroll_preserve_screen_position_commands. (window_scroll_pixel_based, window_scroll_line_based): Check the `scroll-command' property on the last command instead of searching the last command in Vscroll_preserve_screen_position_commands. (syms_of_window): Initialize and staticpro `Qscroll_command'. Put Qscroll_command property on Qscroll_up and Qscroll_down. (scroll-preserve-screen-position): Doc fix. (Vscroll_preserve_screen_position_commands): Remove variable. * simple.el (scroll-up-command, scroll-down-command) (scroll-up-line, scroll-down-line): Put `scroll-command' property on the these symbols. Remove them from `scroll-preserve-screen-position-commands'. * mwheel.el (mwheel-scroll): Put `scroll-command' and `isearch-scroll' properties on the `mwheel-scroll' symbol. Remove it from `scroll-preserve-screen-position-commands'. * isearch.el (isearch-allow-scroll): Doc fix.
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