Make :align-to account for display-line-numbers
These changes also update the various bundled packages to use new feature, and better support customizations of the line-number face. * src/xdisp.c (calc_pixel_width_or_height): Improve commentary. Make :align-to count from the end of the line-number display when the offset or the width form reference that of the text area. (Bug#28855) * src/indent.c (Fline_number_display_width): Implement support for the PIXELWISE argument being 'columns'. Update the doc string. (syms_of_indent): New symbol 'columns'. * lisp/ruler-mode.el (ruler-mode-window-col, ruler-mode-ruler): Call line-number-display-width with last argument 'columns'. * lisp/proced.el (proced-header-line): Call line-number-display-width with 2nd arg 'columns', which also fixes a problem when display-line-numbers is nil. * lisp/emacs-lisp/tabulated-list.el (tabulated-list-line-number-width): Call line-number-display-width with 2nd arg 'columns. (tabulated-list-entry-lnum-width): Remove unneeded defvar. (tabulated-list-print, tabulated-list-print-entry): No need to account for the value of tabulated-list-entry-lnum-width. (tabulated-list--current-lnum-width): New defvar. (tabulated-list-watch-line-number-width): New function. (tabulated-list-mode): Bind tabulated-list--current-lnum-width locally, and set up tabulated-list-watch-line-number-width as pre-redisplay-functions hook. * doc/lispref/display.texi (Size of Displayed Text): Document the 'columns' value of the PIXELWISE argument. (Pixel Specification): Update and improve the documentation of the supported forms.
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