RibbonBottomBar,RibbonMenuItem,RibbonWindow,RibbonTour: Improved.

lib_source/qml/RibbonBottomBar.qml

@@ -33,11 +33,13 @@ Item {
         }
     }
 
-    Rectangle{
+    RibbonRectangle{
         visible: modern_style
         color: dark_mode ? "#141414" : "#F5F5F5"
         opacity: bg_opacity
         anchors.fill: parent
+        bottomLeftRadius: Qt.platform.os === 'windows' ? RibbonUI.is_win11 ? 7 : 0 : 10
+        bottomRightRadius: bottomLeftRadius
     }
 
     Rectangle{

lib_source/qml/RibbonMenuItem.qml

@@ -69,7 +69,7 @@ MenuItem {
                 icon_source: typeof(control.icon_source) === "number" ? control.icon_source : 0
                 icon_source_filled: typeof(control.icon_source_filled) === "number" ? control.icon_source_filled : icon_source
                 icon_size: label.contentHeight
-                visible: typeof(control.icon_source) === "number"
+                visible: typeof(control.icon_source) === "number" && control.icon_source
                 Layout.alignment: Qt.AlignVCenter
                 filled: pressed || checked
                 color: text_color

lib_source/qml/RibbonTour.qml

@@ -30,6 +30,8 @@ Popup {
     leftInset: 0
     rightInset: 0
     bottomInset: 0
+    x: (Overlay.overlay.width - width) / 2
+    y: (Overlay.overlay.height - height) / 2
     closePolicy: Popup.NoAutoClose
     Overlay.modal:Rectangle{
         color: !RibbonTheme.dark_mode ? Qt.alpha("white", 0.5) : Qt.alpha("black", 0.5)

lib_source/qml/RibbonWindow.qml

@@ -18,6 +18,8 @@ Window {
     property bool comfirmed_quit: false
     property bool blurBehindWindow: true
     property int windows_top_fix: Qt.platform.os === 'windows' ? 1 : 0 // a trick to fix Qt or QWindowKit's bug
+    readonly property int borderWidth: border_rect.border.width
+    readonly property int borderRadius: border_rect.radius
     visible: false
     color: {
         if (blurBehindWindow) {