Add code for "preserving" window sizes.
* frame.c (frame_windows_min_size): New argument IGNORE. (adjust_frame_size): When called from change_frame_size call frame_windows_min_size with IGNORE Qt so we can ignore size restrictions. * dired.el (dired-pop-to-buffer): Call fit-window-to-buffer with `preserve-size' t. (dired-mark-pop-up): Preserve size of window showing marked files. * electric.el (Electric-pop-up-window): * help.el (resize-temp-buffer-window): Call fit-window-to-buffer with `preserve-size' t. * minibuffer.el (minibuffer-completion-help): Use `resize-temp-buffer-window' instead of `fit-window-to-buffer' (Bug#19355). Preserve size of completions window. * register.el (register-preview): Preserve size of register preview window. * tmm.el (tmm-add-prompt): Call fit-window-to-buffer with `preserve-size' t (Bug#1291). * window.el (with-displayed-buffer-window): Add calls to `window-preserve-size'. (window-min-pixel-size, window--preservable-size) (window-preserve-size, window-preserved-size) (window--preserve-size, window--min-size-ignore-p): New functions. (window-min-size, window-min-delta, window--resizable) (window--resize-this-window, split-window-below) (split-window-right): Amend doc-string. (adjust-window-trailing-edge): Handle preserving window sizes. Signal user-error instead of an error when there's no window above or below. (window--min-size-1, window-sizable, window--size-fixed-1) (window-size-fixed-p, window--min-delta-1) (frame-windows-min-size, window--max-delta-1, window-resize) (window--resize-child-windows, window--resize-siblings) (enlarge-window, shrink-window, split-window): Handle preserving window sizes. (window--state-put-2): Handle horizontal scroll bars. (window--display-buffer): Call `preserve-size' if asked for. (display-buffer): Mention `preserve-size' alist member in doc-string. (fit-window-to-buffer): New argument PRESERVE-SIZE.
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