Thanks very much !
>From my iPhone
> 2016年7月8日，00:59，Bram Moolenaar <b...@moolenaar.net>:
>
>
> Patch 7.4.1997
> Problem: Cannot easily scroll the quickfix window.
> Solution: Add ":cbottom".
> Files: src/ex_cmds.h, src/quickfix.c, src/proto/quickfix.pro,
> src/ex_docmd.c, src/testdir/test_quickfix.vim,
> runtime/doc/quickfix.txt
>
>
> *** ../vim-7.4.1996/src/ex_cmds.h 2016-06-12 21:20:50.941837428 +0200
> --- src/ex_cmds.h 2016-07-07 18:19:22.888573565 +0200
> ***************
> *** 259,264 ****
> --- 259,267 ----
> EX(CMD_cbuffer, "cbuffer", ex_cbuffer,
> BANG|RANGE|NOTADR|WORD1|TRLBAR,
> ADDR_LINES),
> + EX(CMD_cbottom, "cbottom", ex_cbottom,
> + TRLBAR,
> + ADDR_LINES),
> EX(CMD_cc, "cc", ex_cc,
> RANGE|NOTADR|COUNT|TRLBAR|BANG,
> ADDR_LINES),
> *** ../vim-7.4.1996/src/quickfix.c 2016-07-02 15:41:41.586523202 +0200
> --- src/quickfix.c 2016-07-07 18:47:44.182954704 +0200
> ***************
> *** 2808,2813 ****
> --- 2808,2848 ----
> }
>
> /*
> + * Move the cursor in the quickfix window to "lnum".
> + */
> + static void
> + qf_win_goto(win_T *win, linenr_T lnum)
> + {
> + win_T *old_curwin = curwin;
> +
> + curwin = win;
> + curbuf = win->w_buffer;
> + curwin->w_cursor.lnum = lnum;
> + curwin->w_cursor.col = 0;
> + #ifdef FEAT_VIRTUALEDIT
> + curwin->w_cursor.coladd = 0;
> + #endif
> + curwin->w_curswant = 0;
> + update_topline(); /* scroll to show the line */
> + redraw_later(VALID);
> + curwin->w_redr_status = TRUE; /* update ruler */
> + curwin = old_curwin;
> + curbuf = curwin->w_buffer;
> + }
> +
> + /*
> + * :cbottom command.
> + */
> + void
> + ex_cbottom(exarg_T *eap UNUSED)
> + {
> + win_T *win = qf_find_win(&ql_info);
> +
> + if (win != NULL && win->w_cursor.lnum !=
> win->w_buffer->b_ml.ml_line_count)
> + qf_win_goto(win, win->w_buffer->b_ml.ml_line_count);
> + }
> +
> + /*
> * Return the number of the current entry (line number in the quickfix
> * window).
> */
> ***************
> *** 2844,2870 ****
> && qf_index <= win->w_buffer->b_ml.ml_line_count
> && old_qf_index != qf_index)
> {
> - win_T *old_curwin = curwin;
> -
> - curwin = win;
> - curbuf = win->w_buffer;
> if (qf_index > old_qf_index)
> {
> ! curwin->w_redraw_top = old_qf_index;
> ! curwin->w_redraw_bot = qf_index;
> }
> else
> {
> ! curwin->w_redraw_top = qf_index;
> ! curwin->w_redraw_bot = old_qf_index;
> }
> ! curwin->w_cursor.lnum = qf_index;
> ! curwin->w_cursor.col = 0;
> ! update_topline(); /* scroll to show the line */
> ! redraw_later(VALID);
> ! curwin->w_redr_status = TRUE; /* update ruler */
> ! curwin = old_curwin;
> ! curbuf = curwin->w_buffer;
> }
> return win != NULL;
> }
> --- 2879,2895 ----
> && qf_index <= win->w_buffer->b_ml.ml_line_count
> && old_qf_index != qf_index)
> {
> if (qf_index > old_qf_index)
> {
> ! win->w_redraw_top = old_qf_index;
> ! win->w_redraw_bot = qf_index;
> }
> else
> {
> ! win->w_redraw_top = qf_index;
> ! win->w_redraw_bot = old_qf_index;
> }
> ! qf_win_goto(win, qf_index);
> }
> return win != NULL;
> }
> *** ../vim-7.4.1996/src/proto/quickfix.pro 2016-01-19 13:21:55.845334290
> +0100
> --- src/proto/quickfix.pro 2016-07-07 18:45:33.744948691 +0200
> ***************
> *** 9,14 ****
> --- 9,15 ----
> void ex_cwindow(exarg_T *eap);
> void ex_cclose(exarg_T *eap);
> void ex_copen(exarg_T *eap);
> + void ex_cbottom(exarg_T *eap);
> linenr_T qf_current_entry(win_T *wp);
> int bt_quickfix(buf_T *buf);
> int bt_nofile(buf_T *buf);
> *** ../vim-7.4.1996/src/ex_docmd.c 2016-06-12 21:20:50.941837428 +0200
> --- src/ex_docmd.c 2016-07-07 18:23:05.425238053 +0200
> ***************
> *** 129,134 ****
> --- 129,135 ----
> # define ex_cclose ex_ni
> # define ex_copen ex_ni
> # define ex_cwindow ex_ni
> + # define ex_cbottom ex_ni
> #endif
> #if !defined(FEAT_QUICKFIX) || !defined(FEAT_EVAL)
> # define ex_cexpr ex_ni
> *** ../vim-7.4.1996/src/testdir/test_quickfix.vim 2016-07-02
> 21:22:46.848282547 +0200
> --- src/testdir/test_quickfix.vim 2016-07-07 18:56:27.686962935 +0200
> ***************
> *** 1414,1416 ****
> --- 1414,1429 ----
> call delete('Xone', 'rf')
> call delete('Xtwo', 'rf')
> endfunc
> +
> + function Test_cbottom()
> + call setqflist([{'filename': 'foo', 'lnum': 42}])
> + copen
> + let wid = win_getid()
> + call assert_equal(1, line('.'))
> + wincmd w
> + call setqflist([{'filename': 'var', 'lnum': 24}], 'a')
> + cbottom
> + call win_gotoid(wid)
> + call assert_equal(2, line('.'))
> + cclose
> + endfunc
> *** ../vim-7.4.1996/runtime/doc/quickfix.txt 2016-07-01 14:48:02.654783860
> +0200
> --- runtime/doc/quickfix.txt 2016-07-07 18:39:14.638727812 +0200
> ***************
> *** 427,432 ****
> --- 437,448 ----
> :lw[indow] [height] Same as ":cwindow", except use the window showing the
> location list for the current window.
>
> + :cbo[ttom] Put the cursor in the last line of the quickfix window
> + and scroll to make it visible. This is useful for
> + when errors are added by an asynchronous callback.
> + Only call it once in a while if there are many
> + updates to avoid a lot of redrawing.
> +
> Normally the quickfix window is at the bottom of the screen. If there are
> vertical splits, it's at the bottom of the rightmost column of windows. To
> make it always occupy the full width: >
> *** ../vim-7.4.1996/src/version.c 2016-07-07 17:32:48.290238465 +0200
> --- src/version.c 2016-07-07 18:57:09.990317860 +0200
> ***************
> *** 760,761 ****
> --- 760,763 ----
> { /* Add new patch number below this line */
> + /**/
> + 1997,
> /**/
>
> --
> hundred-and-one symptoms of being an internet addict:
> 221. Your wife melts your keyboard in the oven.
>
> /// Bram Moolenaar -- b...@moolenaar.net -- http://www.Moolenaar.net \\\
> /// sponsor Vim, vote for features -- http://www.Vim.org/sponsor/ \\\
> \\\ an exciting new programming language -- http://www.Zimbu.org ///
> \\\ help me help AIDS victims -- http://ICCF-Holland.org ///
>
> --
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