implement and integrate multiple overlay arrows with redisplay.
(syms_of_xdisp): DEFVAR_LISP and initialize it.
(last_arrow_position, last_arrow_string): Replace by properties.
(Qlast_arrow_position, Qlast_arrow_string)
(Qoverlay_arrow_string, Qoverlay_arrow_bitmap): New variables.
(syms_of_xdisp): Intern and staticpro them.
(overlay_arrow_string_or_property, update_overlay_arrows)
(overlay_arrow_in_current_buffer_p, overlay_arrows_changed_p)
(overlay_arrow_at_row): New functions for multiple overlay arrows.
(redisplay_internal): Use them instead of directly accessing
Voverlay_arrow_position etc. for multiple overlay arrows.
(mark_window_display_accurate): Use update_overlay_arrows.
(try_cursor_movement): Use overlay_arrow_in_current_buffer_p.
(try_window_id): Use overlay_arrows_changed_p.
(get_overlay_arrow_glyph_row): Add overlay_arrow_string arg.
(display_line): Use overlay_arrow_at_row to check multiple
overlay arrows, and get relevant overlay-arrow-string and
overlay-arrow-bitmap. Set w->overlay_arrow_bitmap accordingly.
(produce_image_glyph): Set pixel_width = 0 for fringe bitmap.
(syms_of_xdisp): Remove last_arrow_position and last_arrow_string.
(desktop-clear-preserve-buffers): Remove redundant info in docstring
already shown by the obsolescence message.
(desktop-truncate, desktop-internal-v2s, desktop-value-to-string): Change
argument name to match docstring.
$(DEL) instead of rm, and ignore exit code.
* lispintro/makefile.w32-in (mostlyclean, clean, maintainer-clean): Use
$(DEL) instead of rm, and ignore exit code.
* lispref/makefile.w32-in (clean, maintainer-clean): Use $(DEL) instead of
rm, and ignore exit code.
* xterm.c (x_calc_absolute_position): Call x_real_positions
to get WM window sizes and use those to calculate position.
(x_set_offset): Removed code commented out.
(dired-at-point-prompter): Treat directories as a directory,
get the directory component from files.
(ffap-string-at-point): Return string from region if region is active.
(ffap-file-at-point): Remove redundant code.
Initialize margin area images to nil.
(breakpoint-bitmap): New defvar for breakpoint fringe bitmaps.
(breakpoint-enabled-bitmap-face)
(breakpoint-disabled-bitmap-face): New faces for bpt in fringe.
(gdb-info-breakpoints-custom): Use gdb-remove-breakpoint-icons.
(gdb-info-breakpoints-custom): Use gdb-put-breakpoint-icon.
(gdb-mouse-toggle-breakpoint): Handle bpt in fringe.
(gdb-reset): Use gdb-remove-breakpoint-icons.
(gdb-put-string): Add dprop arg to specify alternative display
property (for setting fringe bitmap).
(gdb-remove-strings): Doc fix.
(gdb-put-breakpoint-icon): New defun which displays a breakpoint
icon in fringe (if available), or else as icon or text in display
margin. Creates necessary icons in breakpoint-bitmap,
breakpoint-enabled-icon, and/or breakpoint-disabled-icon. Also
make left window margin if required.
(gdb-remove-breakpoint-icons): New defun to remove breakpoint
icons inserted by gdb-put-breakpoint-icon. Remove left margin if
no longer needed.
(gdb-assembler-custom): Use gdb-remove-breakpoint-icons and
gdb-put-breakpoint-icon.
(gdb-assembler-mode): Don't set left-margin-width here.
