Improve prefs.js deadtime settings.

Slightly better and more consistent layout.

prefs.js

@@ -354,8 +354,10 @@ const WorkspaceSettingsWidget = new GObject.Class({
             this.settings.set_boolean('scroll-switch-workspace-one-at-a-time', check.get_active());
         }));
 
-    let dockSettingsGrid3= new Gtk.Grid({row_homogeneous:true,column_homogeneous:false});
-    let deadTimeLabel = new Gtk.Label({label: _("Dead time to wait between each workspace switching [ms]"), use_markup: true, xalign: 0,hexpand:true});
+    let deadTimeSettings= new Gtk.Box({spacing:30, orientation:Gtk.Orientation.HORIZONTAL, homogeneous:false,
+                                       margin_bottom:5});
+    indentWidget(deadTimeSettings);
+    let deadTimeLabel = new Gtk.Label({label: _("Deadtime between each workspace switching [ms]"), use_markup: true, xalign: 0,hexpand:true});
     let deadTime = new Gtk.SpinButton({halign:Gtk.Align.END});
             deadTime.set_sensitive(true);
             deadTime.set_range(0, 1000);
@@ -365,8 +367,6 @@ const WorkspaceSettingsWidget = new GObject.Class({
                 let s = button.get_value_as_int();
                 this.settings.set_int('scroll-switch-workspace-dead-time', s);
             }));
-    dockSettingsGrid3.attach(deadTimeLabel, 0,0,1,1);
-    dockSettingsGrid3.attach(deadTime, 1,0,1,1);
 
     let only1px = new Gtk.RadioButton({label: _("Only a 1px wide area close to the screen edge is active")});
 
@@ -380,10 +380,16 @@ const WorkspaceSettingsWidget = new GObject.Class({
             if(check.get_active()) this.settings.set_boolean('scroll-switch-workspace-whole', true);
         }));
 
+    this.settings.bind('scroll-switch-workspace-one-at-a-time', deadTimeSettings, 'sensitive', Gio.SettingsBindFlags.DEFAULT);
+
+
     this.settings.bind('scroll-switch-workspace', switchWorkspaceMain, 'sensitive', Gio.SettingsBindFlags.DEFAULT);
 
+    deadTimeSettings.add(deadTimeLabel);
+    deadTimeSettings.add(deadTime);
+
     switchWorkspaceMain.add(oneAtATime);
-    switchWorkspaceMain.add(dockSettingsGrid3);
+    switchWorkspaceMain.add(deadTimeSettings);
     switchWorkspaceMain.add(only1px);
     switchWorkspaceMain.add(wholeArea);