patch 8.1.0345: cannot get the window id associated with the location list

Problem:    Cannot get the window id associated with the location list.
Solution:   Add the "filewinid" argument to getloclist(). (Yegappan
            Lakshmanan, closes #3202)

runtime/doc/eval.txt

@@ -4729,6 +4729,10 @@ 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.
 
 getmatches()						*getmatches()*
 		Returns a |List| with all matches previously defined by

src/quickfix.c

@@ -5670,7 +5670,8 @@ enum {
     QF_GETLIST_IDX	= 0x40,
     QF_GETLIST_SIZE	= 0x80,
     QF_GETLIST_TICK	= 0x100,
-    QF_GETLIST_ALL	= 0x1FF,
+    QF_GETLIST_FILEWINID	= 0x200,
+    QF_GETLIST_ALL	= 0x3FF,
 };
 
 /*
@@ -5744,12 +5745,17 @@ qf_winid(qf_info_T *qi)
  * Convert the keys in 'what' to quickfix list property flags.
  */
     static int
-qf_getprop_keys2flags(dict_T *what)
+qf_getprop_keys2flags(dict_T *what, int loclist)
 {
     int		flags = QF_GETLIST_NONE;
 
     if (dict_find(what, (char_u *)"all", -1) != NULL)
+    {
 	flags |= QF_GETLIST_ALL;
+	if (!loclist)
+	    // File window ID is applicable only to location list windows
+	    flags &= ~ QF_GETLIST_FILEWINID;
+    }
 
     if (dict_find(what, (char_u *)"title", -1) != NULL)
 	flags |= QF_GETLIST_TITLE;
@@ -5778,6 +5784,9 @@ qf_getprop_keys2flags(dict_T *what)
     if (dict_find(what, (char_u *)"changedtick", -1) != NULL)
 	flags |= QF_GETLIST_TICK;
 
+    if (loclist && dict_find(what, (char_u *)"filewinid", -1) != NULL)
+	flags |= QF_GETLIST_FILEWINID;
+
     return flags;
 }
 
@@ -5870,6 +5879,8 @@ qf_getprop_defaults(qf_info_T *qi, int flags, dict_T *retdict)
 	status = dict_add_number(retdict, "size", 0);
     if ((status == OK) && (flags & QF_GETLIST_TICK))
 	status = dict_add_number(retdict, "changedtick", 0);
+    if ((status == OK) && (qi != &ql_info) && (flags & QF_GETLIST_FILEWINID))
+	status = dict_add_number(retdict, "filewinid", 0);
 
     return status;
 }
@@ -5883,6 +5894,26 @@ qf_getprop_title(qf_info_T *qi, int qf_idx, dict_T *retdict)
     return dict_add_string(retdict, "title", qi->qf_lists[qf_idx].qf_title);
 }
 
+/*
+ * Returns the identifier of the window used to display files from a location
+ * list.  If there is no associated window, then returns 0. Useful only when
+ * called from a location list window.
+ */
+    static int
+qf_getprop_filewinid(win_T *wp, qf_info_T *qi, dict_T *retdict)
+{
+    int winid = 0;
+
+    if (wp != NULL && IS_LL_WINDOW(wp))
+    {
+	win_T	*ll_wp = qf_find_win_with_loclist(qi);
+	if (ll_wp != NULL)
+	    winid = ll_wp->w_id;
+    }
+
+    return dict_add_number(retdict, "filewinid", winid);
+}
+
 /*
  * Return the quickfix list items/entries as 'items' in retdict
  */
@@ -5963,7 +5994,7 @@ qf_get_properties(win_T *wp, dict_T *what, dict_T *retdict)
     if (wp != NULL)
 	qi = GET_LOC_LIST(wp);
 
-    flags = qf_getprop_keys2flags(what);
+    flags = qf_getprop_keys2flags(what, (wp != NULL));
 
     if (qi != NULL && qi->qf_listcount != 0)
 	qf_idx = qf_getprop_qfidx(qi, what);
@@ -5992,6 +6023,8 @@ qf_get_properties(win_T *wp, dict_T *what, dict_T *retdict)
     if ((status == OK) && (flags & QF_GETLIST_TICK))
 	status = dict_add_number(retdict, "changedtick",
 					qi->qf_lists[qf_idx].qf_changedtick);
+    if ((status == OK) && (wp != NULL) && (flags & QF_GETLIST_FILEWINID))
+	status = qf_getprop_filewinid(wp, qi, retdict);
 
     return status;
 }

src/testdir/test_quickfix.vim

@@ -1973,6 +1973,18 @@ func Xproperty_tests(cchar)
     call g:Xsetlist([], 'r', {'items' : [{'filename' : 'F1', 'lnum' : 10, 'text' : 'L10'}]})
     call assert_equal('TestTitle', g:Xgetlist({'title' : 1}).title)
 
+    " Test for getting id of window associated with a location list window
+    if a:cchar == 'l'
+      only
+      call assert_equal(0, g:Xgetlist({'all' : 1}).filewinid)
+      let wid = win_getid()
+      Xopen
+      call assert_equal(wid, g:Xgetlist({'filewinid' : 1}).filewinid)
+      wincmd w
+      call assert_equal(0, g:Xgetlist({'filewinid' : 1}).filewinid)
+      only
+    endif
+
     " The following used to crash Vim with address sanitizer
     call g:Xsetlist([], 'f')
     call g:Xsetlist([], 'a', {'items' : [{'filename':'F1', 'lnum':10}]})
@@ -3000,7 +3012,17 @@ func Xgetlist_empty_tests(cchar)
   call assert_equal('', g:Xgetlist({'title' : 0}).title)
   call assert_equal(0, g:Xgetlist({'winid' : 0}).winid)
   call assert_equal(0, g:Xgetlist({'changedtick' : 0}).changedtick)
-  call assert_equal({'context' : '', 'id' : 0, 'idx' : 0, 'items' : [], 'nr' : 0, 'size' : 0, 'title' : '', 'winid' : 0, 'changedtick': 0}, g:Xgetlist({'all' : 0}))
+  if a:cchar == 'c'
+    call assert_equal({'context' : '', 'id' : 0, 'idx' : 0,
+		  \ 'items' : [], 'nr' : 0, 'size' : 0,
+		  \ 'title' : '', 'winid' : 0, 'changedtick': 0},
+		  \ g:Xgetlist({'all' : 0}))
+  else
+    call assert_equal({'context' : '', 'id' : 0, 'idx' : 0,
+		\ 'items' : [], 'nr' : 0, 'size' : 0, 'title' : '',
+		\ 'winid' : 0, 'changedtick': 0, 'filewinid' : 0},
+		\ g:Xgetlist({'all' : 0}))
+  endif
 
   " Quickfix window with empty stack
   silent! Xopen
@@ -3033,7 +3055,16 @@ func Xgetlist_empty_tests(cchar)
   call assert_equal('', g:Xgetlist({'id' : qfid, 'title' : 0}).title)
   call assert_equal(0, g:Xgetlist({'id' : qfid, 'winid' : 0}).winid)
   call assert_equal(0, g:Xgetlist({'id' : qfid, 'changedtick' : 0}).changedtick)
-  call assert_equal({'context' : '', 'id' : 0, 'idx' : 0, 'items' : [], 'nr' : 0, 'size' : 0, 'title' : '', 'winid' : 0, 'changedtick' : 0}, g:Xgetlist({'id' : qfid, 'all' : 0}))
+  if a:cchar == 'c'
+    call assert_equal({'context' : '', 'id' : 0, 'idx' : 0, 'items' : [],
+		\ 'nr' : 0, 'size' : 0, 'title' : '', 'winid' : 0,
+		\ 'changedtick' : 0}, g:Xgetlist({'id' : qfid, 'all' : 0}))
+  else
+    call assert_equal({'context' : '', 'id' : 0, 'idx' : 0, 'items' : [],
+		\ 'nr' : 0, 'size' : 0, 'title' : '', 'winid' : 0,
+		\ 'changedtick' : 0, 'filewinid' : 0},
+		\ g:Xgetlist({'id' : qfid, 'all' : 0}))
+  endif
 
   " Non-existing quickfix list number
   call assert_equal('', g:Xgetlist({'nr' : 5, 'context' : 0}).context)
@@ -3045,7 +3076,16 @@ func Xgetlist_empty_tests(cchar)
   call assert_equal('', g:Xgetlist({'nr' : 5, 'title' : 0}).title)
   call assert_equal(0, g:Xgetlist({'nr' : 5, 'winid' : 0}).winid)
   call assert_equal(0, g:Xgetlist({'nr' : 5, 'changedtick' : 0}).changedtick)
-  call assert_equal({'context' : '', 'id' : 0, 'idx' : 0, 'items' : [], 'nr' : 0, 'size' : 0, 'title' : '', 'winid' : 0, 'changedtick' : 0}, g:Xgetlist({'nr' : 5, 'all' : 0}))
+  if a:cchar == 'c'
+    call assert_equal({'context' : '', 'id' : 0, 'idx' : 0, 'items' : [],
+		\ 'nr' : 0, 'size' : 0, 'title' : '', 'winid' : 0,
+		\ 'changedtick' : 0}, g:Xgetlist({'nr' : 5, 'all' : 0}))
+  else
+    call assert_equal({'context' : '', 'id' : 0, 'idx' : 0, 'items' : [],
+		\ 'nr' : 0, 'size' : 0, 'title' : '', 'winid' : 0,
+		\ 'changedtick' : 0, 'filewinid' : 0},
+		\ g:Xgetlist({'nr' : 5, 'all' : 0}))
+  endif
 endfunc
 
 func Test_getqflist()

src/version.c

@@ -794,6 +794,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    345,
 /**/
     344,
 /**/