vim-patch:8.1.1015: quickfix buffer shows up in list, can't get buffer number

Problem:    Quickfix buffer shows up in list, can't get buffer number.
Solution:   Make the quickfix buffer unlisted when the quickfix window is
            closed.  get the quickfix buffer number with getqflist().
            (Yegappan Lakshmanan, closes vim/vim#4113)
647e24ba3d

runtime/doc/builtin.txt

@@ -1284,7 +1284,7 @@ complete_info([{what}])				*complete_info()*
 <
 						*confirm()*
 confirm({msg} [, {choices} [, {default} [, {type}]]])
-		Confirm() offers the user a dialog, from which a choice can be
+		confirm() offers the user a dialog, from which a choice can be
 		made.  It returns the number of the choice.  For the first
 		choice this is 1.
 
@@ -3039,10 +3039,16 @@ getloclist({nr} [, {what}])				*getloclist()*
 		If the optional {what} dictionary argument is supplied, then
 		returns the items listed in {what} as a dictionary. Refer to
 		|getqflist()| for the supported items in {what}.
-		If {what} contains 'filewinid', then returns the id of the
-		window used to display files from the location list. This
-		field is applicable only when called from a location list
-		window. See |location-list-file-window| for more details.
+
+		In addition to the items supported by |getqflist()| in {what},
+		the following item is supported by |getloclist()|:
+
+			filewinid 	id of the window used to display files
+					from the location list. This field is
+					applicable only when called from a
+					location list window. See
+					|location-list-file-window| for more
+					details.
 
 		Returns a |Dictionary| with default values if there is no
 		location list for the window {nr}.
@@ -3218,6 +3224,9 @@ getqflist([{what}])					*getqflist()*
 			nr	get information for this quickfix list; zero
 				means the current quickfix list and "$" means
 				the last quickfix list
+			qfbufnr number of the buffer displayed in the quickfix
+				window. Returns 0 if the quickfix buffer is
+				not present. See |quickfix-buffer|.
 			size	number of entries in the quickfix list
 			title	get the list title |quickfix-title|
 			winid	get the quickfix |window-ID|
@@ -3246,6 +3255,8 @@ getqflist([{what}])					*getqflist()*
 			items	quickfix list entries. If not present, set to
 				an empty list.
 			nr	quickfix list number. If not present, set to 0
+			qfbufnr	number of the buffer displayed in the quickfix
+				window. If not present, set to 0.
 			size	number of entries in the quickfix list. If not
 				present, set to 0.
 			title	quickfix list title text. If not present, set

runtime/doc/eval.txt

@@ -3225,14 +3225,14 @@ text...
 			commands are skipped.
 			When {pattern} is omitted all errors are caught.
 			Examples: >
-		:catch /^Vim:Interrupt$/	" catch interrupts (CTRL-C)
-		:catch /^Vim\%((\a\+)\)\=:E/	" catch all Vim errors
-		:catch /^Vim\%((\a\+)\)\=:/	" catch errors and interrupts
-		:catch /^Vim(write):/		" catch all errors in :write
-		:catch /^Vim\%((\a\+)\)\=:E123/	" catch error E123
-		:catch /my-exception/		" catch user exception
-		:catch /.*/			" catch everything
-		:catch				" same as /.*/
+		:catch /^Vim:Interrupt$/	 " catch interrupts (CTRL-C)
+		:catch /^Vim\%((\a\+)\)\=:E/	 " catch all Vim errors
+		:catch /^Vim\%((\a\+)\)\=:/	 " catch errors and interrupts
+		:catch /^Vim(write):/		 " catch all errors in :write
+		:catch /^Vim\%((\a\+)\)\=:E123:/ " catch error E123
+		:catch /my-exception/		 " catch user exception
+		:catch /.*/			 " catch everything
+		:catch				 " same as /.*/
 <
 			Another character can be used instead of / around the
 			{pattern}, so long as it does not have a special

runtime/doc/quickfix.txt

@@ -571,6 +571,7 @@ location list.
 			second quickfix window.  If [height] is given the
 			existing window will be resized to it.
 
+							*quickfix-buffer*
 			The window will contain a special buffer, with
 			'buftype' equal to "quickfix".  Don't change this!
 			The window will have the w:quickfix_title variable set
@@ -579,7 +580,11 @@ location list.
 			status line if the value of 'statusline' is adjusted
 			properly. Whenever this buffer is modified by a
 			quickfix command or function, the |b:changedtick|
-			variable is incremented.
+			variable is incremented.  You can get the number of
+			this buffer using the getqflist() and getloclist()
+			functions by passing the 'qfbufnr' item. For a
+			location list, this buffer is wiped out when the
+			location list is removed.
 
 							*:lop* *:lopen*
 :lop[en] [height]	Open a window to show the location list for the
@@ -768,12 +773,18 @@ using these functions are below:
     " get the quickfix list window id
     :echo getqflist({'winid' : 0}).winid
 
+    " get the quickfix list window buffer number
+    :echo getqflist({'qfbufnr' : 0}).qfbufnr
+
     " get the context of the current location list
     :echo getloclist(0, {'context' : 0}).context
 
     " get the location list window id of the third window
     :echo getloclist(3, {'winid' : 0}).winid
 
+    " get the location list window buffer number of the third window
+    :echo getloclist(3, {'qfbufnr' : 0}).qfbufnr
+
     " get the file window id of a location list window (winnr: 4)
     :echo getloclist(4, {'filewinid' : 0}).filewinid
 <