[gnome-sudoku/arnaudb/wip/gtk4: 41/43] Fix SudokuView focus controller.

[Arnaud B. <arnaudb src gnome org>]

commit 6162d6f17123da3da2a312c5a9ed35a348453cf9
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Wed Aug 5 19:20:25 2020 +0200

    Fix SudokuView focus controller.

 src/sudoku-view.vala | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)
---
diff --git a/src/sudoku-view.vala b/src/sudoku-view.vala
index 6edbf87..4bcd240 100644
--- a/src/sudoku-view.vala
+++ b/src/sudoku-view.vala
@@ -366,7 +366,7 @@ private class SudokuCellView : Widget
     private inline void draw (DrawingArea _this, Cairo.Context c, int new_width, int new_height)
     {
         RGBA background_color;
-        if (_selected && is_focus)
+        if (_selected && focus_controller.is_focus)
             background_color = selected_bg_color;
         else if (is_fixed)
             background_color = fixed_cell_color;
@@ -599,13 +599,11 @@ public class SudokuView : Widget
                     this.set_selected (cell_row, cell_col);
                     this.update_highlights ();
                     queue_draw ();
-
-                    return false;
                 });
 
-                cell.focus_out_event.connect (() => {
+                cell.focus_controller.leave.connect (() => {
                     if (game.paused)
-                        return false;
+                        return;
 
                     this.set_selected (-1, -1);
                     this.update_highlights ();