RibbonTitleBar: Optimize stay on top.

lib_source/qml/RibbonTitleBar.qml

@@ -112,7 +112,6 @@ Item {
             RibbonButton{
                 id: maximizeBtn
                 show_bg:false
-                show_tooltip: Qt.platform.os !== "windows"
                 icon_source: Window.window.visibility === Window.Maximized ? RibbonIcons.ArrowMinimize : RibbonIcons.ArrowMaximize
                 text_color: titleBar.title_text_color
                 hover_color: "#61C554"
@@ -156,5 +155,18 @@ Item {
             checked: RibbonTheme.dark_mode
             visible: show_darkmode_btn
         }
+        RibbonButton{
+            id: pinBtn
+            show_bg:false
+            icon_source: checked ? RibbonIcons.Pin : RibbonIcons.PinOff
+            icon_source_filled: checked ? RibbonIcons_Filled.Pin : RibbonIcons_Filled.PinOff
+            checkable: true
+            text_color: title_text_color
+            hover_color: Qt.rgba(0,0,0, 0.3)
+            pressed_color: Qt.rgba(0,0,0, 0.4)
+            text_color_reverse: false
+            tip_text: qsTr("Stay on Top")
+            onClicked: Window.window.flags ^= Qt.WindowStaysOnTopHint
+        }
     }
 }