Merge pull request opencv#9850 from klchang:master

vpisarev · vpisarev · commit 9e6ef99422d5 · 2017-10-27T11:22:28.000Z
diff --git a/modules/highgui/src/window_gtk.cpp b/modules/highgui/src/window_gtk.cpp
@@ -1632,7 +1632,7 @@ static gboolean icvOnKeyPress(GtkWidget* widget, GdkEventKey* event, gpointer us
         break;
     case GDK_Return:
     case GDK_Linefeed:
-        code = '\n';
+        code = 13;
         break;
     case GDK_Tab:
         code = '\t';
