Fixed a bug where enter key does not work to confirm delete action (#878)

* Fixed enter key bug
* Added keyboard shortcut

Author: yaira2

Files/Dialogs/ConfirmDeleteDialog.xaml

@@ -2,16 +2,16 @@
     x:Class="Files.Dialogs.ConfirmDeleteDialog"
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:converters="using:Files.Converters"
     xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
     xmlns:local1="using:Files"
     xmlns:local2="using:Files.Helpers"
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
-    xmlns:converters="using:Files.Converters"
     x:Uid="ConfirmDeleteDialog"
     Title="Delete Item(s)"
     CornerRadius="4"
-    mc:Ignorable="d"
-    RequestedTheme="{x:Bind local2:ThemeHelper.RootTheme}">
+    RequestedTheme="{x:Bind local2:ThemeHelper.RootTheme}"
+    mc:Ignorable="d">
     <ContentDialog.Resources>
         <converters:StorageDeleteOptionToBooleanConverter x:Key="StorageDeleteOptionToBooleanConverter" />
     </ContentDialog.Resources>
@@ -41,19 +41,24 @@
             Orientation="Horizontal"
             Spacing="10">
 
-            <Button
-                x:Name="btnCancel"
-                x:Uid="ConfirmDeleteDialogCancelButton"
-                Click="btnCancel_Click"
-                Content="Cancel" />
-
             <Button
                 x:Name="btnDelete"
                 x:Uid="ConfirmDeleteDialogDeleteButton"
                 Background="{ThemeResource SystemAccentColor}"
                 Click="btnDelete_Click"
                 Content="Delete"
-                TabIndex="0" />
+                TabIndex="0">
+                <Button.KeyboardAccelerators>
+                    <KeyboardAccelerator Key="Enter" />
+                    <KeyboardAccelerator Key="Space" />
+                </Button.KeyboardAccelerators>
+            </Button>
+
+            <Button
+                x:Name="btnCancel"
+                x:Uid="ConfirmDeleteDialogCancelButton"
+                Click="btnCancel_Click"
+                Content="Cancel" />
         </StackPanel>
     </Grid>
 </ContentDialog>