[gnome-chess] Hide timers in untimed games

[Michael Catanzaro <mcatanzaro src gnome org>]

commit ed38dbe57bc6809cf24c65fd8cceba84e04a75fc
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Fri Dec 4 12:54:18 2020 -0600

    Hide timers in untimed games
    
    There's no need to show the timers at all if the game is untimed.
    
    Fixes #39

 data/gnome-chess.ui  | 2 +-
 src/gnome-chess.vala | 8 +++++---
 2 files changed, 6 insertions(+), 4 deletions(-)
---
diff --git a/data/gnome-chess.ui b/data/gnome-chess.ui
index b1194fc..94d30ce 100644
--- a/data/gnome-chess.ui
+++ b/data/gnome-chess.ui
@@ -308,7 +308,7 @@
                   </packing>
                 </child>
                 <child>
-                  <object class="GtkBox">
+                  <object class="GtkBox" id="clock_box">
                     <property name="visible">True</property>
                     <property name="can-focus">False</property>
                     <property name="spacing">6</property>
diff --git a/src/gnome-chess.vala b/src/gnome-chess.vala
index cb2ed83..3cf5d22 100644
--- a/src/gnome-chess.vala
+++ b/src/gnome-chess.vala
@@ -39,6 +39,7 @@ public class ChessApplication : Gtk.Application
     private Widget next_move_button;
     private Widget last_move_button;
     private ComboBox history_combo;
+    private Box clock_box;
     private Widget white_time_label;
     private Widget black_time_label;
     private Widget timer_increment_label;
@@ -169,6 +170,7 @@ Copyright © 2015–2016 Sahil Sareen""";
         next_move_button = (Widget) builder.get_object ("next_move_button");
         last_move_button = (Widget) builder.get_object ("last_move_button");
         history_combo = (ComboBox) builder.get_object ("history_combo");
+        clock_box = (Box) builder.get_object ("clock_box");
         white_time_label = (Widget) builder.get_object ("white_time_label");
         black_time_label = (Widget) builder.get_object ("black_time_label");
         view_container = (Container) builder.get_object ("view_container");
@@ -626,6 +628,8 @@ Copyright © 2015–2016 Sahil Sareen""";
             pgn_game.clock_type = clock_type.to_string ();
         }
 
+        clock_box.visible = game.clock != null;
+
         if (game.clock != null)
         {
             game.clock.extra_seconds = (int) timer_increment_adj_value;
@@ -1596,10 +1600,8 @@ Copyright © 2015–2016 Sahil Sareen""";
     }
 
     private string make_clock_text (ChessClock? clock, Color color)
+        requires (clock != null)
     {
-        if (clock == null)
-            return "∞";
-
         int time;
         if (color == Color.WHITE)
             time = game.clock.white_remaining_seconds;