Add ui in general setting page

Author: Jack251970

Flow.Launcher/Languages/en.xaml

@@ -131,6 +131,8 @@
     <system:String x:Key="historyResultsForHomePage">Show History Results in Home Page</system:String>
     <system:String x:Key="historyResultsCountForHomePage">Maximum History Results Shown in Home Page</system:String>
     <system:String x:Key="homeToggleBoxToolTip">This can only be edited if plugin supports Home feature and Home Page is enabled.</system:String>
+    <system:String x:Key="showAtTopmost">Show Search Window at Topmost</system:String>
+    <system:String x:Key="showAtTopmostToolTip">Show search window above other windows</system:String>
 
     <!--  Setting Plugin  -->
     <system:String x:Key="searchplugin">Search Plugin</system:String>

Flow.Launcher/SettingPages/Views/SettingsPaneGeneral.xaml

@@ -77,6 +77,17 @@
                     OnContent="{DynamicResource enable}" />
             </cc:Card>
 
+            <cc:Card
+                Title="{DynamicResource showAtTopmost}"
+                Margin="0 14 0 0"
+                Icon="&#xE923;"
+                Sub="{DynamicResource showAtTopmostToolTip}">
+                <ui:ToggleSwitch
+                    IsOn="{Binding Settings.ShowAtTopmost}"
+                    OffContent="{DynamicResource disable}"
+                    OnContent="{DynamicResource enable}" />
+            </cc:Card>
+
             <cc:CardGroup Margin="0 14 0 0">
                 <cc:Card Title="{DynamicResource SearchWindowPosition}" Icon="&#xe7f4;">
                     <StackPanel Orientation="Horizontal">