patch 8.2.3759: quickfix buffer becomes hidden while still in a window

Problem:    Quickfix buffer becomes hidden while still in a window.
Solution:   Check if the closed window is the last window showing the quickfix
            buffer. (Yegappan Lakshmanan, closes #9303, closes #9300)

src/version.c

@@ -753,6 +753,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3759,
 /**/
     3758,
 /**/