fix popups space bar problem

SafeExamBrowser.UserInterface.Desktop/Controls/ActionCenter/KeyboardLayoutControl.xaml.cs

@@ -6,6 +6,7 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
  */
 
+using System;
 using System.Threading.Tasks;
 using System.Windows.Automation;
 using System.Windows.Controls;
@@ -50,7 +51,22 @@ namespace SafeExamBrowser.UserInterface.Desktop.Controls.ActionCenter
 					LayoutsStackPanel.Children[0].Focus();
 				}));
 			};
-			Button.MouseLeave += (o, args) => Task.Delay(250).ContinueWith(_ => Dispatcher.Invoke(() => Popup.IsOpen = Popup.IsMouseOver));
+			var lastOpenedBySpacePress = DateTime.MinValue;
+			Button.PreviewKeyDown += (o, args) =>
+			{
+				if (args.Key == System.Windows.Input.Key.Space)                 // for some reason, the popup immediately closes again if opened by a Space Bar key event - as a mitigation, we record the space bar event and leave the popup open for at least 3 seconds
+				{
+					lastOpenedBySpacePress = DateTime.Now;
+				}
+			};
+			Button.MouseLeave += (o, args) => Task.Delay(250).ContinueWith(_ => Dispatcher.Invoke(() =>
+			{
+				if (Popup.IsOpen && (DateTime.Now - lastOpenedBySpacePress).TotalSeconds < 3)
+				{
+					return;
+				}
+				Popup.IsOpen = Popup.IsMouseOver;
+			}));
 			Popup.MouseLeave += (o, args) => Task.Delay(250).ContinueWith(_ => Dispatcher.Invoke(() => Popup.IsOpen = IsMouseOver));
 			Popup.Opened += (o, args) => Grid.Background = Brushes.Gray;
 			Popup.Closed += (o, args) => Grid.Background = originalBrush;

SafeExamBrowser.UserInterface.Desktop/Controls/ActionCenter/NetworkControl.xaml.cs

@@ -45,7 +45,22 @@ namespace SafeExamBrowser.UserInterface.Desktop.Controls.ActionCenter
 
 			adapter.Changed += () => Dispatcher.InvokeAsync(Update);
 			Button.Click += (o, args) => Popup.IsOpen = !Popup.IsOpen;
-			Button.MouseLeave += (o, args) => Task.Delay(250).ContinueWith(_ => Dispatcher.Invoke(() => Popup.IsOpen = Popup.IsMouseOver));
+			var lastOpenedBySpacePress = DateTime.MinValue;
+			Button.PreviewKeyDown += (o, args) =>
+			{
+				if (args.Key == System.Windows.Input.Key.Space)                 // for some reason, the popup immediately closes again if opened by a Space Bar key event - as a mitigation, we record the space bar event and leave the popup open for at least 3 seconds
+				{
+					lastOpenedBySpacePress = DateTime.Now;
+				}
+			};
+			Button.MouseLeave += (o, args) => Task.Delay(250).ContinueWith(_ => Dispatcher.Invoke(() =>
+			{
+				if (Popup.IsOpen && (DateTime.Now - lastOpenedBySpacePress).TotalSeconds < 3)
+				{
+					return;
+				}
+				Popup.IsOpen = Popup.IsMouseOver;
+			}));
 			Popup.MouseLeave += (o, args) => Task.Delay(250).ContinueWith(_ => Dispatcher.Invoke(() => Popup.IsOpen = IsMouseOver));
 			Popup.Opened += (o, args) => Grid.Background = Brushes.Gray;
 			Popup.Closed += (o, args) => Grid.Background = originalBrush;

SafeExamBrowser.UserInterface.Desktop/Controls/ActionCenter/RaiseHandControl.xaml.cs

@@ -55,7 +55,22 @@ namespace SafeExamBrowser.UserInterface.Desktop.Controls.ActionCenter
 			RaisedIcon = new XamlIconResource { Uri = new Uri("pack://application:,,,/SafeExamBrowser.UserInterface.Desktop;component/Images/Hand_Raised.xaml") };
 			Icon.Content = IconResourceLoader.Load(LoweredIcon);
 
-			NotificationButton.MouseLeave += (o, args) => Task.Delay(250).ContinueWith(_ => Dispatcher.Invoke(() => Popup.IsOpen = Popup.IsMouseOver));
+			var lastOpenedBySpacePress = DateTime.MinValue;
+			NotificationButton.PreviewKeyDown += (o, args) =>
+			{
+				if (args.Key == System.Windows.Input.Key.Space)                 // for some reason, the popup immediately closes again if opened by a Space Bar key event - as a mitigation, we record the space bar event and leave the popup open for at least 3 seconds
+				{
+					lastOpenedBySpacePress = DateTime.Now;
+				}
+			};
+			NotificationButton.MouseLeave += (o, args) => Task.Delay(250).ContinueWith(_ => Dispatcher.Invoke(() =>
+			{
+				if (Popup.IsOpen && (DateTime.Now - lastOpenedBySpacePress).TotalSeconds < 3)
+				{
+					return;
+				}
+				Popup.IsOpen = Popup.IsMouseOver;
+			}));
 			NotificationButton.PreviewMouseLeftButtonUp += NotificationButton_PreviewMouseLeftButtonUp;
 			NotificationButton.PreviewMouseRightButtonUp += NotificationButton_PreviewMouseRightButtonUp;
 			NotificationButton.ToolTip = text.Get(TextKey.Notification_ProctoringHandLowered);

SafeExamBrowser.UserInterface.Desktop/Controls/Taskbar/AudioControl.xaml.cs

@@ -48,7 +48,22 @@ namespace SafeExamBrowser.UserInterface.Desktop.Controls.Taskbar
 
 			audio.VolumeChanged += Audio_VolumeChanged;
 			Button.Click += (o, args) => Popup.IsOpen = !Popup.IsOpen;
-			Button.MouseLeave += (o, args) => Task.Delay(250).ContinueWith(_ => Dispatcher.Invoke(() => Popup.IsOpen = Popup.IsMouseOver));
+			var lastOpenedBySpacePress = DateTime.MinValue;
+			Button.PreviewKeyDown += (o, args) =>
+			{
+				if (args.Key == System.Windows.Input.Key.Space)                 // for some reason, the popup immediately closes again if opened by a Space Bar key event - as a mitigation, we record the space bar event and leave the popup open for at least 3 seconds
+				{
+					lastOpenedBySpacePress = DateTime.Now;
+				}
+			};
+			Button.MouseLeave += (o, args) => Task.Delay(250).ContinueWith(_ => Dispatcher.Invoke(() =>
+			{
+				if (Popup.IsOpen && (DateTime.Now - lastOpenedBySpacePress).TotalSeconds < 3)
+				{
+					return;
+				}
+				Popup.IsOpen = Popup.IsMouseOver;
+			}));
 			MuteButton.Click += MuteButton_Click;
 			MutedIcon = new XamlIconResource { Uri = new Uri("pack://application:,,,/SafeExamBrowser.UserInterface.Desktop;component/Images/Audio_Muted.xaml") };
 			NoDeviceIcon = new XamlIconResource { Uri = new Uri("pack://application:,,,/SafeExamBrowser.UserInterface.Desktop;component/Images/Audio_NoDevice.xaml") };

SafeExamBrowser.UserInterface.Desktop/Controls/Taskbar/KeyboardLayoutControl.xaml.cs

@@ -54,7 +54,22 @@ namespace SafeExamBrowser.UserInterface.Desktop.Controls.Taskbar
 					((LayoutsStackPanel.Children[0] as ContentControl).Content as UIElement).Focus();
 				})));
 			};
-			Button.MouseLeave += (o, args) => Task.Delay(250).ContinueWith(_ => Dispatcher.Invoke(() => Popup.IsOpen = Popup.IsMouseOver));
+			var lastOpenedBySpacePress = DateTime.MinValue;
+			Button.PreviewKeyDown += (o, args) =>
+			{
+				if (args.Key == System.Windows.Input.Key.Space)                 // for some reason, the popup immediately closes again if opened by a Space Bar key event - as a mitigation, we record the space bar event and leave the popup open for at least 3 seconds
+				{
+					lastOpenedBySpacePress = DateTime.Now;
+				}
+			};
+			Button.MouseLeave += (o, args) => Task.Delay(250).ContinueWith(_ => Dispatcher.Invoke(() =>
+			{
+				if (Popup.IsOpen && (DateTime.Now - lastOpenedBySpacePress).TotalSeconds < 3)
+				{
+					return;
+				}
+				Popup.IsOpen = Popup.IsMouseOver;
+			}));
 			Popup.CustomPopupPlacementCallback = new CustomPopupPlacementCallback(Popup_PlacementCallback);
 			Popup.MouseLeave += (o, args) => Task.Delay(250).ContinueWith(_ => Dispatcher.Invoke(() => Popup.IsOpen = IsMouseOver));
 

SafeExamBrowser.UserInterface.Desktop/Controls/Taskbar/NetworkControl.xaml.cs

@@ -45,8 +45,23 @@ namespace SafeExamBrowser.UserInterface.Desktop.Controls.Taskbar
 			var originalBrush = Button.Background;
 
 			adapter.Changed += () => Dispatcher.InvokeAsync(Update);
+			var lastOpenedBySpacePress = DateTime.MinValue;
+			Button.PreviewKeyDown += (o, args) =>
+			{
+				if (args.Key == System.Windows.Input.Key.Space)					// for some reason, the popup immediately closes again if opened by a Space Bar key event - as a mitigation, we record the space bar event and leave the popup open for at least 3 seconds
+				{
+					lastOpenedBySpacePress = DateTime.Now;
+				}
+			};
 			Button.Click += (o, args) => Popup.IsOpen = !Popup.IsOpen;
-			Button.MouseLeave += (o, args) => Task.Delay(250).ContinueWith(_ => Dispatcher.Invoke(() => Popup.IsOpen = Popup.IsMouseOver));
+			Button.MouseLeave += (o, args) => Task.Delay(250).ContinueWith(_ => Dispatcher.Invoke(() =>
+			{
+				if (Popup.IsOpen && (DateTime.Now - lastOpenedBySpacePress).TotalSeconds < 3)
+				{
+					return;
+				}
+				Popup.IsOpen = Popup.IsMouseOver;
+			}));
 			Popup.CustomPopupPlacementCallback = new CustomPopupPlacementCallback(Popup_PlacementCallback);
 			Popup.MouseLeave += (o, args) => Task.Delay(250).ContinueWith(_ => Dispatcher.Invoke(() => Popup.IsOpen = IsMouseOver));
 			WirelessIcon.Child = GetWirelessIcon(0);

SafeExamBrowser.UserInterface.Desktop/Controls/Taskbar/RaiseHandControl.xaml.cs

@@ -55,7 +55,22 @@ namespace SafeExamBrowser.UserInterface.Desktop.Controls.Taskbar
 			RaisedIcon = new XamlIconResource { Uri = new Uri("pack://application:,,,/SafeExamBrowser.UserInterface.Desktop;component/Images/Hand_Raised.xaml") };
 			Icon.Content = IconResourceLoader.Load(LoweredIcon);
 
-			NotificationButton.MouseLeave += (o, args) => Task.Delay(250).ContinueWith(_ => Dispatcher.Invoke(() => Popup.IsOpen = Popup.IsMouseOver));
+			var lastOpenedBySpacePress = DateTime.MinValue;
+			NotificationButton.PreviewKeyDown += (o, args) =>
+			{
+				if (args.Key == System.Windows.Input.Key.Space)                 // for some reason, the popup immediately closes again if opened by a Space Bar key event - as a mitigation, we record the space bar event and leave the popup open for at least 3 seconds
+				{
+					lastOpenedBySpacePress = DateTime.Now;
+				}
+			};
+			NotificationButton.MouseLeave += (o, args) => Task.Delay(250).ContinueWith(_ => Dispatcher.Invoke(() =>
+			{
+				if (Popup.IsOpen && (DateTime.Now - lastOpenedBySpacePress).TotalSeconds < 3)
+				{
+					return;
+				}
+				Popup.IsOpen = Popup.IsMouseOver;
+			}));
 			NotificationButton.PreviewMouseLeftButtonUp += NotificationButton_PreviewMouseLeftButtonUp;
 			NotificationButton.PreviewMouseRightButtonUp += NotificationButton_PreviewMouseRightButtonUp;
 			NotificationButton.ToolTip = text.Get(TextKey.Notification_ProctoringHandLowered);

SafeExamBrowser.UserInterface.Mobile/Controls/ActionCenter/AudioControl.xaml.cs

@@ -49,7 +49,22 @@ namespace SafeExamBrowser.UserInterface.Mobile.Controls.ActionCenter
 
 			audio.VolumeChanged += Audio_VolumeChanged;
 			Button.Click += (o, args) => Popup.IsOpen = !Popup.IsOpen;
-			Button.MouseLeave += (o, args) => Task.Delay(250).ContinueWith(_ => Dispatcher.Invoke(() => Popup.IsOpen = Popup.IsMouseOver));
+			var lastOpenedBySpacePress = DateTime.MinValue;
+			Button.PreviewKeyDown += (o, args) =>
+			{
+				if (args.Key == System.Windows.Input.Key.Space)                 // for some reason, the popup immediately closes again if opened by a Space Bar key event - as a mitigation, we record the space bar event and leave the popup open for at least 3 seconds
+				{
+					lastOpenedBySpacePress = DateTime.Now;
+				}
+			};
+			Button.MouseLeave += (o, args) => Task.Delay(250).ContinueWith(_ => Dispatcher.Invoke(() =>
+			{
+				if (Popup.IsOpen && (DateTime.Now - lastOpenedBySpacePress).TotalSeconds < 3)
+				{
+					return;
+				}
+				Popup.IsOpen = Popup.IsMouseOver;
+			}));
 			MuteButton.Click += MuteButton_Click;
 			MutedIcon = new XamlIconResource { Uri = new Uri("pack://application:,,,/SafeExamBrowser.UserInterface.Mobile;component/Images/Audio_Muted.xaml") };
 			NoDeviceIcon = new XamlIconResource { Uri = new Uri("pack://application:,,,/SafeExamBrowser.UserInterface.Mobile;component/Images/Audio_Light_NoDevice.xaml") };

SafeExamBrowser.UserInterface.Mobile/Controls/ActionCenter/KeyboardLayoutControl.xaml.cs

@@ -6,6 +6,7 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
  */
 
+using System;
 using System.Threading.Tasks;
 using System.Windows.Automation;
 using System.Windows.Controls;
@@ -50,7 +51,22 @@ namespace SafeExamBrowser.UserInterface.Mobile.Controls.ActionCenter
 					LayoutsStackPanel.Children[0].Focus();
 				}));
 			};
-			Button.MouseLeave += (o, args) => Task.Delay(250).ContinueWith(_ => Dispatcher.Invoke(() => Popup.IsOpen = Popup.IsMouseOver));
+			var lastOpenedBySpacePress = DateTime.MinValue;
+			Button.PreviewKeyDown += (o, args) =>
+			{
+				if (args.Key == System.Windows.Input.Key.Space)                 // for some reason, the popup immediately closes again if opened by a Space Bar key event - as a mitigation, we record the space bar event and leave the popup open for at least 3 seconds
+				{
+					lastOpenedBySpacePress = DateTime.Now;
+				}
+			};
+			Button.MouseLeave += (o, args) => Task.Delay(250).ContinueWith(_ => Dispatcher.Invoke(() =>
+			{
+				if (Popup.IsOpen && (DateTime.Now - lastOpenedBySpacePress).TotalSeconds < 3)
+				{
+					return;
+				}
+				Popup.IsOpen = Popup.IsMouseOver;
+			}));
 			Popup.MouseLeave += (o, args) => Task.Delay(250).ContinueWith(_ => Dispatcher.Invoke(() => Popup.IsOpen = IsMouseOver));
 			Popup.Opened += (o, args) => Grid.Background = Brushes.Gray;
 			Popup.Closed += (o, args) => Grid.Background = originalBrush;

SafeExamBrowser.UserInterface.Mobile/Controls/ActionCenter/NetworkControl.xaml.cs

@@ -45,7 +45,22 @@ namespace SafeExamBrowser.UserInterface.Mobile.Controls.ActionCenter
 
 			adapter.Changed += () => Dispatcher.InvokeAsync(Update);
 			Button.Click += (o, args) => Popup.IsOpen = !Popup.IsOpen;
-			Button.MouseLeave += (o, args) => Task.Delay(250).ContinueWith(_ => Dispatcher.Invoke(() => Popup.IsOpen = Popup.IsMouseOver));
+			var lastOpenedBySpacePress = DateTime.MinValue;
+			Button.PreviewKeyDown += (o, args) =>
+			{
+				if (args.Key == System.Windows.Input.Key.Space)                 // for some reason, the popup immediately closes again if opened by a Space Bar key event - as a mitigation, we record the space bar event and leave the popup open for at least 3 seconds
+				{
+					lastOpenedBySpacePress = DateTime.Now;
+				}
+			};
+			Button.MouseLeave += (o, args) => Task.Delay(250).ContinueWith(_ => Dispatcher.Invoke(() =>
+			{
+				if (Popup.IsOpen && (DateTime.Now - lastOpenedBySpacePress).TotalSeconds < 3)
+				{
+					return;
+				}
+				Popup.IsOpen = Popup.IsMouseOver;
+			}));
 			Popup.MouseLeave += (o, args) => Task.Delay(250).ContinueWith(_ => Dispatcher.Invoke(() => Popup.IsOpen = IsMouseOver));
 			Popup.Opened += (o, args) => Grid.Background = Brushes.Gray;
 			Popup.Closed += (o, args) => Grid.Background = originalBrush;

SafeExamBrowser.UserInterface.Mobile/Controls/ActionCenter/RaiseHandControl.xaml.cs

@@ -55,7 +55,22 @@ namespace SafeExamBrowser.UserInterface.Mobile.Controls.ActionCenter
 			RaisedIcon = new XamlIconResource { Uri = new Uri("pack://application:,,,/SafeExamBrowser.UserInterface.Desktop;component/Images/Hand_Raised.xaml") };
 			Icon.Content = IconResourceLoader.Load(LoweredIcon);
 
-			NotificationButton.MouseLeave += (o, args) => Task.Delay(250).ContinueWith(_ => Dispatcher.Invoke(() => Popup.IsOpen = Popup.IsMouseOver));
+			var lastOpenedBySpacePress = DateTime.MinValue;
+			NotificationButton.PreviewKeyDown += (o, args) =>
+			{
+				if (args.Key == System.Windows.Input.Key.Space)                 // for some reason, the popup immediately closes again if opened by a Space Bar key event - as a mitigation, we record the space bar event and leave the popup open for at least 3 seconds
+				{
+					lastOpenedBySpacePress = DateTime.Now;
+				}
+			};
+			NotificationButton.MouseLeave += (o, args) => Task.Delay(250).ContinueWith(_ => Dispatcher.Invoke(() =>
+			{
+				if (Popup.IsOpen && (DateTime.Now - lastOpenedBySpacePress).TotalSeconds < 3)
+				{
+					return;
+				}
+				Popup.IsOpen = Popup.IsMouseOver;
+			}));
 			NotificationButton.PreviewMouseLeftButtonUp += NotificationButton_PreviewMouseLeftButtonUp;
 			NotificationButton.PreviewMouseRightButtonUp += NotificationButton_PreviewMouseRightButtonUp;
 			NotificationButton.ToolTip = text.Get(TextKey.Notification_ProctoringHandLowered);

SafeExamBrowser.UserInterface.Mobile/Controls/Taskbar/AudioControl.xaml.cs

@@ -48,7 +48,22 @@ namespace SafeExamBrowser.UserInterface.Mobile.Controls.Taskbar
 
 			audio.VolumeChanged += Audio_VolumeChanged;
 			Button.Click += (o, args) => Popup.IsOpen = !Popup.IsOpen;
-			Button.MouseLeave += (o, args) => Task.Delay(250).ContinueWith(_ => Dispatcher.Invoke(() => Popup.IsOpen = Popup.IsMouseOver));
+			var lastOpenedBySpacePress = DateTime.MinValue;
+			Button.PreviewKeyDown += (o, args) =>
+			{
+				if (args.Key == System.Windows.Input.Key.Space)                 // for some reason, the popup immediately closes again if opened by a Space Bar key event - as a mitigation, we record the space bar event and leave the popup open for at least 3 seconds
+				{
+					lastOpenedBySpacePress = DateTime.Now;
+				}
+			};
+			Button.MouseLeave += (o, args) => Task.Delay(250).ContinueWith(_ => Dispatcher.Invoke(() =>
+			{
+				if (Popup.IsOpen && (DateTime.Now - lastOpenedBySpacePress).TotalSeconds < 3)
+				{
+					return;
+				}
+				Popup.IsOpen = Popup.IsMouseOver;
+			}));
 			MuteButton.Click += MuteButton_Click;
 			MutedIcon = new XamlIconResource { Uri = new Uri("pack://application:,,,/SafeExamBrowser.UserInterface.Mobile;component/Images/Audio_Muted.xaml") };
 			NoDeviceIcon = new XamlIconResource { Uri = new Uri("pack://application:,,,/SafeExamBrowser.UserInterface.Mobile;component/Images/Audio_NoDevice.xaml") };

SafeExamBrowser.UserInterface.Mobile/Controls/Taskbar/KeyboardLayoutControl.xaml.cs

@@ -54,7 +54,22 @@ namespace SafeExamBrowser.UserInterface.Mobile.Controls.Taskbar
 					((LayoutsStackPanel.Children[0] as ContentControl).Content as UIElement).Focus();
 				})));
 			};
-			Button.MouseLeave += (o, args) => Task.Delay(250).ContinueWith(_ => Dispatcher.Invoke(() => Popup.IsOpen = Popup.IsMouseOver));
+			var lastOpenedBySpacePress = DateTime.MinValue;
+			Button.PreviewKeyDown += (o, args) =>
+			{
+				if (args.Key == System.Windows.Input.Key.Space)                 // for some reason, the popup immediately closes again if opened by a Space Bar key event - as a mitigation, we record the space bar event and leave the popup open for at least 3 seconds
+				{
+					lastOpenedBySpacePress = DateTime.Now;
+				}
+			};
+			Button.MouseLeave += (o, args) => Task.Delay(250).ContinueWith(_ => Dispatcher.Invoke(() =>
+			{
+				if (Popup.IsOpen && (DateTime.Now - lastOpenedBySpacePress).TotalSeconds < 3)
+				{
+					return;
+				}
+				Popup.IsOpen = Popup.IsMouseOver;
+			}));
 			Popup.CustomPopupPlacementCallback = new CustomPopupPlacementCallback(Popup_PlacementCallback);
 			Popup.MouseLeave += (o, args) => Task.Delay(250).ContinueWith(_ => Dispatcher.Invoke(() => Popup.IsOpen = IsMouseOver));
 

SafeExamBrowser.UserInterface.Mobile/Controls/Taskbar/NetworkControl.xaml.cs

@@ -46,7 +46,22 @@ namespace SafeExamBrowser.UserInterface.Mobile.Controls.Taskbar
 
 			adapter.Changed += () => Dispatcher.InvokeAsync(Update);
 			Button.Click += (o, args) => Popup.IsOpen = !Popup.IsOpen;
-			Button.MouseLeave += (o, args) => Task.Delay(250).ContinueWith(_ => Dispatcher.Invoke(() => Popup.IsOpen = Popup.IsMouseOver));
+			var lastOpenedBySpacePress = DateTime.MinValue;
+			Button.PreviewKeyDown += (o, args) =>
+			{
+				if (args.Key == System.Windows.Input.Key.Space)                 // for some reason, the popup immediately closes again if opened by a Space Bar key event - as a mitigation, we record the space bar event and leave the popup open for at least 3 seconds
+				{
+					lastOpenedBySpacePress = DateTime.Now;
+				}
+			};
+			Button.MouseLeave += (o, args) => Task.Delay(250).ContinueWith(_ => Dispatcher.Invoke(() =>
+			{
+				if (Popup.IsOpen && (DateTime.Now - lastOpenedBySpacePress).TotalSeconds < 3)
+				{
+					return;
+				}
+				Popup.IsOpen = Popup.IsMouseOver;
+			}));
 			Popup.CustomPopupPlacementCallback = new CustomPopupPlacementCallback(Popup_PlacementCallback);
 			Popup.MouseLeave += (o, args) => Task.Delay(250).ContinueWith(_ => Dispatcher.Invoke(() => Popup.IsOpen = IsMouseOver));
 			WirelessIcon.Child = GetWirelessIcon(0);

SafeExamBrowser.UserInterface.Mobile/Controls/Taskbar/RaiseHandControl.xaml.cs

@@ -55,7 +55,22 @@ namespace SafeExamBrowser.UserInterface.Mobile.Controls.Taskbar
 			RaisedIcon = new XamlIconResource { Uri = new Uri("pack://application:,,,/SafeExamBrowser.UserInterface.Desktop;component/Images/Hand_Raised.xaml") };
 			Icon.Content = IconResourceLoader.Load(LoweredIcon);
 
-			NotificationButton.MouseLeave += (o, args) => Task.Delay(250).ContinueWith(_ => Dispatcher.Invoke(() => Popup.IsOpen = Popup.IsMouseOver));
+			var lastOpenedBySpacePress = DateTime.MinValue;
+			NotificationButton.PreviewKeyDown += (o, args) =>
+			{
+				if (args.Key == System.Windows.Input.Key.Space)                 // for some reason, the popup immediately closes again if opened by a Space Bar key event - as a mitigation, we record the space bar event and leave the popup open for at least 3 seconds
+				{
+					lastOpenedBySpacePress = DateTime.Now;
+				}
+			};
+			NotificationButton.MouseLeave += (o, args) => Task.Delay(250).ContinueWith(_ => Dispatcher.Invoke(() =>
+			{
+				if (Popup.IsOpen && (DateTime.Now - lastOpenedBySpacePress).TotalSeconds < 3)
+				{
+					return;
+				}
+				Popup.IsOpen = Popup.IsMouseOver;
+			}));
 			NotificationButton.PreviewMouseLeftButtonUp += NotificationButton_PreviewMouseLeftButtonUp;
 			NotificationButton.PreviewMouseRightButtonUp += NotificationButton_PreviewMouseRightButtonUp;
 			NotificationButton.ToolTip = text.Get(TextKey.Notification_ProctoringHandLowered);