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The purpose of these changes is to improve the code handling the display of buffers in windows, switching to previous and next buffers in windows and restoring a previous state after quitting or killing buffers. In particular it does: - Add a new window parameter 'quit-restore-prev' so a window can keep its initial 'quit-restore' parameter and undoing a sequence of quit window operations becomes more reliable (Bug#59862). - Optionally have 'kill-buffer' call 'quit-restore-window' for all windows showing the argument buffer (Bug#59862). - Add a new hook so it's possible to avoid that a window gets deleted implicitly by functions like 'kill-buffer' (Bug#71386). - Add a new option to make 'quit-restore-window' delete windows more aggressively (Bug#59862). - Immediately remove killed buffers from all windows' previous and next buffers. For windows that are already dead, use a weak hash table to be used by 'kill-buffer'. This avoids any special handling of such windows by the garbage collector. - Immediately remove 'quit-restore' and 'quit-restore-prev' window parameters that reference killed buffers. These parameters have no more use once their buffers got killed. - Make sure that internal windows do not have any previous and next buffers. This fixes a silly memory leak. - Make sure that after set_window_buffer and some wset_buffer calls the buffer now shown in the window does not appear in the lists of that window's previous and next buffers. The old behavior could make functions investigating these lists erroneously believe that there still existed some other buffer to switch to. * src/alloc.c (mark_discard_killed_buffers): Remove function. (mark_window): No more filter previous and next buffer lists. * src/window.h (struct window): Move up prev_buffers and next-buffers in structure; they are now treated by the collector as usual. * src/window.c (window_discard_buffer_from_alist) (window_discard_buffer_from_list) (window_discard_buffer_from_window) (window_discard_buffer_from_dead_windows) (Fwindow_discard_buffer): New functions. (set_window_buffer): Discard BUFFER from WINDOW's previous and next buffers. (make_parent_window): Make sure internal windows have no previous and next buffers. (make_window): Don't initialize window's previous and next buffers, they are handled by allocate_window now. (Fdelete_window_internal): Add WINDOW to window_dead_windows_table. (Fset_window_configuration): Remove resurrected window from window_dead_windows_table. Make sure buffers set by wset_buffer calls are not recorded in window's previous and next buffers. (delete_all_child_windows): Add deleted windows to window_dead_windows_table. (window_dead_windows_table): New weak hash table to record dead windows that are stored in saved window configurations. * src/buffer.c (Fkill_buffer): Call new function 'window_discard_buffer_from_dead_windows'. * lisp/window.el (window-deletable-functions): New hook. (window-deletable-p): Update doc-string. Run 'window-deletable-functions' (Bug#71386). (unrecord-window-buffer): New argument ALL. Move body to 'window-discard-buffer-from-window' so that if ALL is non-nil, WINDOW's 'quit-restore' and 'quit-restore-prev' parameters get removed too. (switch-to-prev-buffer): Don't care about killed buffers here; 'replace-buffer-in-windows' should have done that already. Use 'unrecord-window-buffer'. (switch-to-next-buffer): Don't care about killed buffers here; 'replace-buffer-in-windows' should do that now. (kill-buffer-quit-windows): New option. (delete-windows-on): Update doc-string. Handle new option 'kill-buffer-quit-windows'. Update 'unrecord-window-buffer' calls. (replace-buffer-in-windows): Update doc-string. Handle new option 'kill-buffer-quit-windows' (Bug#59862). Update call to 'unrecord-window-buffer'. (quit-restore-window-no-switch): New option. (quit-restore-window): Update doc-string. Handle additional values of BURY-OR-KILL so to not kill a buffer about to be killed by the caller. Handle 'quit-restore-prev' parameter (Bug#59862). Handle new option 'quit-restore-window-no-switch' (Bug#59862). (quit-windows-on): Update doc-string. Call 'quit-window-hook' and call 'quit-restore-window' directly so that the buffer does not get buried or killed by the latter. Update 'unrecord-window-buffer' call. (display-buffer-record-window): Update doc-string. Handle new `quit-restore-prev' parameter (Bug#59862). (switch-to-buffer): Call 'display-buffer-record-window' so a latter 'quit-restore-window' can use its parameters. * doc/lispref/windows.texi (Deleting Windows): Describe implicit deletion of windows and new hook 'window-deletable-functions'. (Buffers and Windows): Update description of 'replace-buffer-in-windows'. Describe new option 'kill-buffer-quit-windows'. (Quitting Windows): Describe 'quit-restore-prev' parameter and new option 'quit-restore-window-no-switch'. Update description of 'quit-restore-window'. (Window Parameters): Mention 'quit-restore-prev' parameter. * etc/NEWS: Add entries for 'window-deletable-functions', 'kill-buffer-quit-windows', 'quit-restore-window-no-switch'. mention new parameter 'quit-restore-prev' and new argument values for 'quit-restore-window'. |
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