patch 8.1.1245: ":copen 10" sets height in full-height window

Problem:    ":copen 10" sets height in full-height window. (Daniel Hahler)
Solution:   Don't set the height if the quickfix window is full height.
            (closes #4325)

src/quickfix.c

@@ -4016,7 +4016,8 @@ qf_goto_cwindow(qf_info_T *qi, int resize, int sz, int vertsplit)
 	    if (sz != win->w_width)
 		win_setwidth(sz);
 	}
-	else if (sz != win->w_height)
+	else if (sz != win->w_height
+			 && win->w_height + win->w_status_height < cmdline_row)
 	    win_setheight(sz);
     }
 

src/testdir/test_quickfix.vim

@@ -279,6 +279,15 @@ func Test_cwindow()
   call XwindowTests('l')
 endfunc
 
+func Test_copenHeight()
+  copen
+  wincmd H
+  let height = winheight(0)
+  copen 10
+  call assert_equal(height, winheight(0))
+  quit
+endfunc
+
 " Tests for the :cfile, :lfile, :caddfile, :laddfile, :cgetfile and :lgetfile
 " commands.
 func XfileTests(cchar)

src/version.c

@@ -767,6 +767,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1245,
 /**/
     1244,
 /**/