diff --git a/src/quickfix.c b/src/quickfix.c
index aa4e765..e58318a 100644
--- a/src/quickfix.c
+++ b/src/quickfix.c
@@ -3044,12 +3044,9 @@
     static int
 qf_jump_to_usable_window(int qf_fnum, int newwin, int *opened_window)
 {
-    win_T	*usable_win_ptr = NULL;
-    int		usable_win;
+    win_T	*usable_wp = NULL;
+    int		usable_win = FALSE;
     qf_info_T	*ll_ref = NULL;
-    win_T	*win;
-
-    usable_win = 0;
 
     // If opening a new window, then don't use the location list referred by
     // the current window.  Otherwise two windows will refer to the same
@@ -3060,17 +3057,17 @@
     if (ll_ref != NULL)
     {
 	// Find a non-quickfix window with this location list
-	usable_win_ptr = qf_find_win_with_loclist(ll_ref);
-	if (usable_win_ptr != NULL)
-	    usable_win = 1;
+	usable_wp = qf_find_win_with_loclist(ll_ref);
+	if (usable_wp != NULL)
+	    usable_win = TRUE;
     }
 
     if (!usable_win)
     {
 	// Locate a window showing a normal buffer
-	win = qf_find_win_with_normal_buf();
+	win_T	*win = qf_find_win_with_normal_buf();
 	if (win != NULL)
-	    usable_win = 1;
+	    usable_win = TRUE;
     }
 
     // If no usable window is found and 'switchbuf' contains "usetab"
@@ -3089,7 +3086,7 @@
     else
     {
 	if (curwin->w_llist_ref != NULL)	// In a location window
-	    qf_goto_win_with_ll_file(usable_win_ptr, qf_fnum, ll_ref);
+	    qf_goto_win_with_ll_file(usable_wp, qf_fnum, ll_ref);
 	else					// In a quickfix window
 	    qf_goto_win_with_qfl_file(qf_fnum);
     }
@@ -3454,17 +3451,12 @@
 	qfl->qf_ptr = qf_ptr;
 	qfl->qf_index = qf_index;
     }
-    if (p_swb != old_swb)
+    if (p_swb != old_swb && p_swb == empty_option)
     {
 	// Restore old 'switchbuf' value, but not when an autocommand or
 	// modeline has changed the value.
-	if (p_swb == empty_option)
-	{
-	    p_swb = old_swb;
-	    swb_flags = old_swb_flags;
-	}
-	else
-	    free_string_option(old_swb);
+	p_swb = old_swb;
+	swb_flags = old_swb_flags;
     }
     decr_quickfix_busy();
 }
diff --git a/src/testdir/test_quickfix.vim b/src/testdir/test_quickfix.vim
index 0744364..eec3bde 100644
--- a/src/testdir/test_quickfix.vim
+++ b/src/testdir/test_quickfix.vim
@@ -14,7 +14,7 @@
     command! -nargs=* Xaddexpr <mods>caddexpr <args>
     command! -nargs=* -count Xolder <mods><count>colder <args>
     command! -nargs=* Xnewer <mods>cnewer <args>
-    command! -nargs=* Xopen <mods>copen <args>
+    command! -nargs=* Xopen <mods> copen <args>
     command! -nargs=* Xwindow <mods>cwindow <args>
     command! -nargs=* Xbottom <mods>cbottom <args>
     command! -nargs=* Xclose <mods>cclose <args>
@@ -32,8 +32,8 @@
     command! -count -nargs=* -bang Xnfile <mods><count>cnfile<bang> <args>
     command! -nargs=* -bang Xpfile <mods>cpfile<bang> <args>
     command! -nargs=* Xexpr <mods>cexpr <args>
-    command! -range -nargs=* Xvimgrep <mods><count>vimgrep <args>
-    command! -nargs=* Xvimgrepadd <mods>vimgrepadd <args>
+    command! -count -nargs=* Xvimgrep <mods> <count>vimgrep <args>
+    command! -nargs=* Xvimgrepadd <mods> vimgrepadd <args>
     command! -nargs=* Xgrep <mods> grep <args>
     command! -nargs=* Xgrepadd <mods> grepadd <args>
     command! -nargs=* Xhelpgrep helpgrep <args>
@@ -51,7 +51,7 @@
     command! -nargs=* Xaddexpr <mods>laddexpr <args>
     command! -nargs=* -count Xolder <mods><count>lolder <args>
     command! -nargs=* Xnewer <mods>lnewer <args>
-    command! -nargs=* Xopen <mods>lopen <args>
+    command! -nargs=* Xopen <mods> lopen <args>
     command! -nargs=* Xwindow <mods>lwindow <args>
     command! -nargs=* Xbottom <mods>lbottom <args>
     command! -nargs=* Xclose <mods>lclose <args>
@@ -69,8 +69,8 @@
     command! -count -nargs=* -bang Xnfile <mods><count>lnfile<bang> <args>
     command! -nargs=* -bang Xpfile <mods>lpfile<bang> <args>
     command! -nargs=* Xexpr <mods>lexpr <args>
-    command! -range -nargs=* Xvimgrep <mods><count>lvimgrep <args>
-    command! -nargs=* Xvimgrepadd <mods>lvimgrepadd <args>
+    command! -count -nargs=* Xvimgrep <mods> <count>lvimgrep <args>
+    command! -nargs=* Xvimgrepadd <mods> lvimgrepadd <args>
     command! -nargs=* Xgrep <mods> lgrep <args>
     command! -nargs=* Xgrepadd <mods> lgrepadd <args>
     command! -nargs=* Xhelpgrep lhelpgrep <args>
@@ -157,6 +157,12 @@
 	\ ' 2 Data.Text:20 col 10 warning  22: ModuleWarning',
 	\ ' 3 Data/Text.hs:30 col 15 warning  33: FileWarning'], l)
 
+  " For help entries in the quickfix list, only the filename without directory
+  " should be displayed
+  Xhelpgrep setqflist()
+  let l = split(execute('Xlist 1', ''), "\n")
+  call assert_match('^ 1 [^\\/]\{-}:', l[0])
+
   " Error cases
   call assert_fails('Xlist abc', 'E488:')
 endfunc
@@ -269,6 +275,14 @@
   Xwindow
   call assert_true(winnr('$') == 1)
 
+  " Specifying the width should adjust the width for a vertically split
+  " quickfix window.
+  vert Xopen
+  call assert_equal(10, winwidth(0))
+  vert Xopen 12
+  call assert_equal(12, winwidth(0))
+  Xclose
+
   if a:cchar == 'c'
       " Opening the quickfix window in multiple tab pages should reuse the
       " quickfix buffer
@@ -443,6 +457,10 @@
   call assert_fails('Xnfile', err)
   call assert_fails('Xpfile', err)
 
+  Xexpr ''
+  let cmd = (a:cchar == 'c') ? '$cc' : '$ll'
+  call assert_fails(cmd, 'E42:')
+
   call s:create_test_file('Xqftestfile1')
   call s:create_test_file('Xqftestfile2')
 
@@ -466,6 +484,12 @@
   call assert_equal(5, g:Xgetlist({'idx':0}).idx)
   2Xcc
   call assert_equal(2, g:Xgetlist({'idx':0}).idx)
+  if a:cchar == 'c'
+    cc
+  else
+    ll
+  endif
+  call assert_equal(2, g:Xgetlist({'idx':0}).idx)
   10Xcc
   call assert_equal(6, g:Xgetlist({'idx':0}).idx)
   Xlast
@@ -474,6 +498,14 @@
   call assert_equal(11, line('.'))
   call assert_fails('Xnext', 'E553')
   call assert_fails('Xnfile', 'E553')
+  " To process the range using quickfix list entries, directly use the
+  " quickfix commands (don't use the user defined commands)
+  if a:cchar == 'c'
+    $cc
+  else
+    $ll
+  endif
+  call assert_equal(6, g:Xgetlist({'idx':0}).idx)
   Xrewind
   call assert_equal('Xqftestfile1', bufname('%'))
   call assert_equal(5, line('.'))
@@ -577,6 +609,26 @@
   " This wipes out the buffer, make sure that doesn't cause trouble.
   Xclose
 
+  " When the current window is vertically split, jumping to a help match
+  " should open the help window at the top.
+  only | enew
+  let w1 = win_getid()
+  vert new
+  let w2 = win_getid()
+  Xnext
+  let w3 = win_getid()
+  call assert_true(&buftype == 'help')
+  call assert_true(winnr() == 1)
+  call assert_equal(['col', [['leaf', w3],
+        \ ['row', [['leaf', w2], ['leaf', w1]]]]], winlayout())
+
+  new | only
+  set buftype=help
+  set modified
+  call assert_fails('Xnext', 'E37:')
+  set nomodified
+  new | only
+
   if a:cchar == 'l'
       " When a help window is present, running :lhelpgrep should reuse the
       " help window and not the current window
@@ -1618,9 +1670,11 @@
   call assert_equal(winid, win_getid())
   2cnext
   call assert_equal(winid, win_getid())
-  enew
 
+  " Test for 'switchbuf' set to search for files in windows in the current
+  " tabpage and jump to an existing window (if present)
   set switchbuf=useopen
+  enew
   cfirst | cnext
   call assert_equal(file1_winid, win_getid())
   2cnext
@@ -1628,6 +1682,8 @@
   2cnext
   call assert_equal(file2_winid, win_getid())
 
+  " Test for 'switchbuf' set to search for files in tabpages and jump to an
+  " existing tabpage (if present)
   enew | only
   set switchbuf=usetab
   tabedit Xqftestfile1
@@ -1646,6 +1702,7 @@
   call assert_equal(4, tabpagenr())
   tabfirst | tabonly | enew
 
+  " Test for 'switchbuf' set to open a new window for every file
   set switchbuf=split
   cfirst | cnext
   call assert_equal(1, winnr('$'))
@@ -1653,9 +1710,10 @@
   call assert_equal(2, winnr('$'))
   cnext | cnext
   call assert_equal(3, winnr('$'))
-  enew | only
 
+  " Test for 'switchbuf' set to open a new tabpage for every file
   set switchbuf=newtab
+  enew | only
   cfirst | cnext
   call assert_equal(1, tabpagenr('$'))
   cnext | cnext
@@ -1672,6 +1730,8 @@
   call assert_equal(last_winid, win_getid())
   enew | only
 
+  " With an empty 'switchbuf', jumping to a quickfix entry should open the
+  " file in an existing window (if present)
   set switchbuf=
   edit Xqftestfile1
   let file1_winid = win_getid()
@@ -1701,6 +1761,32 @@
   call assert_equal(4, tabpagenr())
   tabfirst | tabonly | enew | only
 
+  " Jumping to a file that is not present in any of the tabpages and the
+  " current tabpage doesn't have any usable windows, should open it in a new
+  " window in the current tabpage.
+  copen | only
+  cfirst
+  call assert_equal(1, tabpagenr())
+  call assert_equal('Xqftestfile1', bufname(''))
+
+  " If opening a file changes 'switchbuf', then the new value should be
+  " retained.
+  call writefile(["vim: switchbuf=split"], 'Xqftestfile1')
+  enew | only
+  set switchbuf&vim
+  cexpr "Xqftestfile1:1:10"
+  call assert_equal('split', &switchbuf)
+  call writefile(["vim: switchbuf=usetab"], 'Xqftestfile1')
+  enew | only
+  set switchbuf=useopen
+  cexpr "Xqftestfile1:1:10"
+  call assert_equal('usetab', &switchbuf)
+  call writefile(["vim: switchbuf&vim"], 'Xqftestfile1')
+  enew | only
+  set switchbuf=useopen
+  cexpr "Xqftestfile1:1:10"
+  call assert_equal('', &switchbuf)
+
   call delete('Xqftestfile1')
   call delete('Xqftestfile2')
   call delete('Xqftestfile3')
@@ -1727,11 +1813,16 @@
   call append(6, ['Buffer', 'Window'])
 
   let l = g:Xgetlist()
-
   call assert_equal(5, l[0].lnum)
   call assert_equal(6, l[2].lnum)
   call assert_equal(13, l[3].lnum)
 
+  " If a file doesn't have any quickfix entries, then deleting lines in the
+  " file should not update the quickfix list
+  call g:Xsetlist([], 'f')
+  1,2delete
+  call assert_equal([], g:Xgetlist())
+
   enew!
   call delete(fname)
 endfunc
@@ -1755,14 +1846,21 @@
   enew! | only
   set makeef&vim
   silent Xgrep Grep_Test_Text: test_quickfix.vim
-  call assert_true(len(g:Xgetlist()) == 3)
+  call assert_true(len(g:Xgetlist()) == 4)
   Xopen
   call assert_true(w:quickfix_title =~ '^:grep')
   Xclose
   enew
   set makeef=Temp_File_##
   silent Xgrepadd GrepAdd_Test_Text: test_quickfix.vim
-  call assert_true(len(g:Xgetlist()) == 6)
+  call assert_true(len(g:Xgetlist()) == 7)
+
+  call writefile(['Vim'], 'XtestTempFile')
+  set makeef=XtestTempFile
+  silent Xgrep Grep_Test_Text: test_quickfix.vim
+  call assert_equal(4, len(g:Xgetlist()))
+  call assert_false(filereadable('XtestTempFile'))
+  set makeef&vim
 endfunc
 
 func Test_grep()
@@ -2446,6 +2544,25 @@
   call assert_true(winnr('$') == 2)
   call assert_true(winnr() == 1)
 
+  " open the quickfix buffer in two windows and jump to an entry. Should open
+  " the file in the first quickfix window.
+  enew | only
+  copen
+  let bnum = bufnr('')
+  exe 'sbuffer ' . bnum
+  wincmd b
+  cfirst
+  call assert_equal(2, winnr())
+  call assert_equal('F1', bufname(''))
+  enew | only
+  exe 'sb' bnum
+  exe 'botright sb' bnum
+  wincmd t
+  clast
+  call assert_equal(2, winnr())
+  call assert_equal('quickfix', getwinvar(1, '&buftype'))
+  call assert_equal('quickfix', getwinvar(3, '&buftype'))
+
   enew | only
   set efm&vim
 endfunc
@@ -2499,7 +2616,7 @@
   call assert_equal(2, len(l))
   call assert_equal('Editor:Notepad NOTEPAD', l[0].text)
 
-  Xvimgrep #\cvim#g Xtestfile?
+  10Xvimgrep #\cvim#g Xtestfile?
   let l = g:Xgetlist()
   call assert_equal(2, len(l))
   call assert_equal(8, l[0].col)
@@ -3524,6 +3641,41 @@
   call setqflist([], 'f')
 endfunc
 
+" Test for an autocmd changing the current directory when running vimgrep
+func Xvimgrep_autocmd_cd(cchar)
+  call s:setup_commands(a:cchar)
+
+  %bwipe
+  let save_cwd = getcwd()
+
+  augroup QF_Test
+    au!
+    autocmd BufRead * silent cd %:p:h
+  augroup END
+
+  10Xvimgrep /vim/ Xdir/**
+  let l = g:Xgetlist()
+  call assert_equal('f1.txt', bufname(l[0].bufnr))
+  call assert_equal('f2.txt', fnamemodify(bufname(l[2].bufnr), ':t'))
+
+  augroup QF_Test
+    au!
+  augroup END
+
+  exe 'cd ' . save_cwd
+endfunc
+
+func Test_vimgrep_autocmd_cd()
+  call mkdir('Xdir/a', 'p')
+  call mkdir('Xdir/b', 'p')
+  call writefile(['a_L1_vim', 'a_L2_vim'], 'Xdir/a/f1.txt')
+  call writefile(['b_L1_vim', 'b_L2_vim'], 'Xdir/b/f2.txt')
+  call Xvimgrep_autocmd_cd('c')
+  call Xvimgrep_autocmd_cd('l')
+  %bwipe
+  call delete('Xdir', 'rf')
+endfunc
+
 " The following test used to crash Vim
 func Test_lhelpgrep_autocmd()
   lhelpgrep quickfix
diff --git a/src/version.c b/src/version.c
index bbc74f3..e1ffa9e 100644
--- a/src/version.c
+++ b/src/version.c
@@ -742,6 +742,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2320,
+/**/
     2319,
 /**/
     2318,