GNU bug report logs - #28936
move_it_in_display_line_to returns MOVE_POS_MATCH_OR_ZV before ZV

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From: Keith David Bershatsky <esq <at> lawlist.com>
To: 28936 <at> debbugs.gnu.org
Cc: Drew Adams <drew.adams <at> oracle.com>
Subject: bug#28936: enhancement request: remove vertical scroll bar automatically when not needed
Date: Tue, 24 Oct 2017 20:46:06 -0700

Here is a first draft with a simple test (modifying xdisp.c), which probably nukes more than just the selected window's scroll bars when removing them, but it may be sufficient to revive this enhancement request in the event anyone is interested.

 finish_scroll_bars:

   if ((WINDOW_HAS_VERTICAL_SCROLL_BAR (w) || WINDOW_HAS_HORIZONTAL_SCROLL_BAR (w))
        && ZV - BEGV > BUF_Z (XBUFFER (w->contents)) - w->window_end_pos - marker_position (w->start))
    {
      if (WINDOW_HAS_VERTICAL_SCROLL_BAR (w))
	/* Set the thumb's position and size.  */
	set_vertical_scroll_bar (w);

      if (WINDOW_HAS_HORIZONTAL_SCROLL_BAR (w))
	/* Set the thumb's position and size.  */
	set_horizontal_scroll_bar (w);

      /* Note that we actually used the scroll bar attached to this
	 window, so it shouldn't be deleted at the end of redisplay.  */
      if (FRAME_TERMINAL (f)->redeem_scroll_bar_hook)
        (*FRAME_TERMINAL (f)->redeem_scroll_bar_hook) (w);
    }
    else
      {
        (*FRAME_TERMINAL (f)->condemn_scroll_bars_hook) (f);
        (*FRAME_TERMINAL (f)->judge_scroll_bars_hook) (f);
      }


Keith

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