patch 8.2.2631: commands from winrestcmd() do not always work properly

Problem:    Commands from winrestcmd() do not always work properly. (Leonid V.
            Fedorenchik)
Solution:   Repeat the size commands twice. (closes #7988)

src/evalwindow.c

@@ -1007,11 +1007,17 @@ f_winnr(typval_T *argvars UNUSED, typval_T *rettv)
 f_winrestcmd(typval_T *argvars UNUSED, typval_T *rettv)
 {
     win_T	*wp;
-    int		winnr = 1;
+    int		i;
+    int		winnr;
     garray_T	ga;
     char_u	buf[50];
 
     ga_init2(&ga, (int)sizeof(char), 70);
+
+    // Do this twice to handle some window layouts properly.
+    for (i = 0; i < 2; ++i)
+    {
+	winnr = 1;
 	FOR_ALL_WINDOWS(wp)
 	{
 	    sprintf((char *)buf, ":%dresize %d|", winnr, wp->w_height);
@@ -1020,6 +1026,7 @@ f_winrestcmd(typval_T *argvars UNUSED, typval_T *rettv)
 	    ga_concat(&ga, buf);
 	    ++winnr;
 	}
+    }
     ga_append(&ga, NUL);
 
     rettv->vval.v_string = ga.ga_data;

src/testdir/test_window_cmd.vim

@@ -631,16 +631,29 @@ endfunc
 func Test_winrestcmd()
   2split
   3vsplit
-  let a = winrestcmd()
+  let restcmd = winrestcmd()
   call assert_equal(2, winheight(0))
   call assert_equal(3, winwidth(0))
   wincmd =
   call assert_notequal(2, winheight(0))
   call assert_notequal(3, winwidth(0))
-  exe a
+  exe restcmd
   call assert_equal(2, winheight(0))
   call assert_equal(3, winwidth(0))
   only
+
+  wincmd v
+  wincmd s
+  wincmd v
+  redraw
+  let restcmd = winrestcmd()
+  wincmd _
+  wincmd |
+  exe restcmd
+  redraw
+  call assert_equal(restcmd, winrestcmd())
+
+  only
 endfunc
 
 func Fun_RenewFile()

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2631,
 /**/
     2630,
 /**/