[gnome-sudoku/arnaudb/wip/gtk4: 16/27] TODO try a fix.

[Arnaud B. <arnaudb src gnome org>]

commit c1da7d4829747a8bc5089cb0a1f827d1c497e447
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Sun Apr 12 22:07:00 2020 +0200

    TODO try a fix.

 src/sudoku-view.vala | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/sudoku-view.vala b/src/sudoku-view.vala
index 3fc37f6..423f9e6 100644
--- a/src/sudoku-view.vala
+++ b/src/sudoku-view.vala
@@ -131,7 +131,7 @@ private class SudokuCellView : DrawingArea
         if (button != Gdk.BUTTON_PRIMARY && button != Gdk.BUTTON_SECONDARY)
             return;
 
-        if (!is_focus)
+        if (!is_focus ())
             grab_focus ();
         if (game.mode == GameMode.PLAY && (is_fixed || game.paused))
             return;