patch 8.2.3090: in rare cases the cursor may be somewhere in a folded line

Problem:    With concealing enabled and indirectly closing a fold the cursor
            may be somewhere in a folded line.
Solution:   Recompute the cursor position when the cursor line can be
            concealed. (closes #8480)

src/drawscreen.c

@@ -1379,6 +1379,12 @@ fold_line(
 	curwin->w_cline_folded = TRUE;
 	curwin->w_valid |= (VALID_CHEIGHT|VALID_CROW);
     }
+
+# ifdef FEAT_CONCEAL
+    // When the line was not folded w_wrow may have been set, recompute it.
+    if (wp == curwin && lnum == wp->w_cursor.lnum && conceal_cursor_line(wp))
+	curs_columns(TRUE);
+# endif
 }
 #endif
 

src/version.c

@@ -755,6 +755,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3090,
 /**/
     3089,
 /**/