Add "q" item for 'statusline'. Add w:quickfix_title. (Lech Lorens)

runtime/doc/options.txt

@@ -6523,6 +6523,7 @@ A jump table for the options with a short description can be found at |Q_op|.
 	y F   Type of file in the buffer, e.g., "[vim]".  See 'filetype'.
 	Y F   Type of file in the buffer, e.g., ",VIM".  See 'filetype'.
 	      {not available when compiled without |+autocmd| feature}
+	q S   "[Quickfix List]", "[Location List]" or empty.
 	k S   Value of "b:keymap_name" or 'keymap' when |:lmap| mappings are
 	      being used: "<keymap>"
 	n N   Buffer number.

runtime/doc/quickfix.txt

@@ -301,7 +301,7 @@ use this code: >
 =============================================================================
 2. The error window					*quickfix-window*
 
-							*:cope* *:copen*
+					    *:cope* *:copen* *w:quickfix_title*
 :cope[n] [height]	Open a window to show the current list of errors.
 			When [height] is given, the window becomes that high
 			(if there is room).  Otherwise the window is made ten
@@ -310,7 +310,11 @@ use this code: >
 			'buftype' equal to "quickfix".  Don't change this!
 			If there already is a quickfix window, it will be made
 			the current window.  It is not possible to open a
-			second quickfix window.
+			second quickfix window. The window will have the
+			w:quickfix_title variable set which will indicate the
+			command that produced the quickfix list. This can be
+			used to compose a custom status line if the value of
+			'statusline' is adjusted properly.
 
 							*:lop* *:lopen*
 :lop[en] [height]	Open a window to show the location list for the

runtime/doc/todo.txt

@@ -30,9 +30,6 @@ be worked on, but only if you sponsor Vim development.  See |sponsor|.
 							*known-bugs*
 -------------------- Known bugs and current work -----------------------
 
-Include patch for horizontal scoll wheel? (Bjorn Winckler, 2010 Jul 20)
-Additional patch Jul 21.
-
 6   In the quickfix window statusline add the command used to get the list of
     errors, e.g. ":make foo", ":grep something *.c".
     New patch 2010 Jul 24

runtime/ftplugin/quickfix.vim

@@ -0,0 +1,16 @@
+" Vim filetype plugin file
+" Language:     Vim's quickfix window
+" Maintainer:   Lech Lorens <Lech.Lorens@gmail.com>
+" Last Changed: 22 Jul 2010
+
+if exists("b:did_ftplugin")
+  finish
+endif
+
+" Don't load another plugin for this buffer
+let b:did_ftplugin = 1
+
+let b:undo_ftplugin = "setl stl<"
+
+" Display the command that produced the list in the quickfix window:
+setlocal stl=%q%{exists('w:quickfix_title')?\ '\ '.w:quickfix_title\ :\ ''}