F. Jason Park 617ddb8089 Consider all windows in erc-scrolltobottom-mode ... * etc/ERC-NEWS: Add entry for option `erc-scrolltobottom-all', and mention explicit hook-depth intervals reserved by ERC. * lisp/erc/erc-backend.el (erc--hide-prompt): Change hook depth on `pre-command-hook' from 91 to 80. * lisp/erc/erc-goodies.el (erc-input-line-position): Mention secondary role when new option `erc-scroll-to-bottom-relaxed' is non-nil. (erc-scrolltobottom-all): New option that decides whether module `scrolltobottom' affects all windows or just the selected one, as it always has. (erc-scrolltobottom-relaxed): New option to leave the prompt stationary instead of forcing it to the bottom of the window. (erc-scrolltobottom-mode, erc-scrolltobottom-enable, erc-scrolltobottom-disable): Use `erc--scrolltobottom-setup' instead of `erc-add-scroll-to-bottom' for adding and removing local hooks and instead of ranging over buffers when removing them. Also add and remove new hook members when `erc-scrolltobottom-all' is non-nil. (erc--scrolltobottom-relaxed-commands, erc--scrolltobottom-window-info, erc--scrolltobottom-post-force-commands, erc--scrolltobottom-relaxed-skip-commands): New internal variables. (erc--scrolltobottom-on-pre-command erc--scrolltobottom-on-post-command): New functions resembling `erc-possibly-scroll-to-bottom' that try to avoid scrolling repeatedly for no reason. (erc--scrolltobottom-on-pre-command-relaxed, erc--scrolltobottom-on-post-command-relaxed): New commands to help implement `erc-scroll-to-bottom-relaxed'. (erc--scrolltobottom-at-prompt-minibuffer-active): New function to scroll to bottom on window configuration changes when using the minibuffer. (erc--scrolltobottom-all): New function to scroll all windows displaying the current buffer. (erc-add-scroll-to-bottom): Deprecate this function because it is now unused in the default client and trivial to implement otherwise. (erc--scrolltobottom-setup): New generic function to perform teardown as well as setup depending on the state of the module's mode variable. Also add an implementation specifically for `erc-scrolltobottom-all' that locally modifies different sets of hooks depending on `erc-scrolltobottom-relaxed'. (erc--scrolltobottom-on-pre-insert): New generic function that remembers the last `window-start' and maybe the current screen line before inserting a message, in order to restore it afterward. (erc--scrolltobottom-confirm): New function, a replacement for `erc-scroll-to-bottom' that returns non-nil when it's actually recentered the window. For now, used only when `erc-scrolltobottom-all' is enabled. (erc-move-to-prompt-setup): Add `erc-move-to-prompt' to `pre-command-hook' at a depth of 70 in the current buffer. (erc-keep-place-mode, erc-keep-place-enable): Change hook depth from 0 to 85. (erc--keep-place-indicator-setup): Add overlay arrow `after-string' in non-graphical settings in case users have time stamps or other content occupying the left margin. (erc-keep-place-indicator-mode, erc-keep-place-indicator-enable): Change hook depth from 90 to 85 locally so as not to conflict with a value of t, for append. (erc--keep-place-indicator-on-global-module): Change hook depth from 90 to 85 locally. * test/lisp/erc/erc-scenarios-scrolltobottom-relaxed.el: New file. * test/lisp/erc/erc-scenarios-scrolltobottom.el: New file. * test/lisp/erc/resources/erc-scenarios-common.el (erc-scenarios-common--term-size, erc-scenarios-common--run-in-term, erc-scenarios-common-interactive-debug-term-p, erc-scenarios-common-with-noninteractive-in-term): New test macro and supporting helper function and variables to facilitate running scenario-based tests in an inferior Emacs, in term-mode. (erc-scenarios-common--at-win-end-p, erc-scenarios-common--above-win-end-p, erc-scenarios-common--prompt-past-win-end-p, erc-scenarios-common--recenter-top-bottom-around, erc-scenarios-common--recenter-top-bottom, erc-scenarios-scrolltobottom--normal): New test fixture and assertion helper functions. * test/lisp/erc/resources/scrolltobottom/help.eld: New file. (Bug#64855)		2023-09-10 17:58:20 -07:00
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help.eld