Require textFormat declaration for all Text elements.

shell/Ui/Dropdown.qml

@@ -71,6 +71,7 @@ Item {
     spacing: Style.spacing.labelGap
 
     Text {
+      textFormat: Text.PlainText
       visible: root.showLabel && root.label !== ""
       text: root.label
       color: Qt.darker(root.foreground, 1.4)
@@ -110,6 +111,7 @@ Item {
       }
 
       Text {
+        textFormat: Text.PlainText
         anchors.left: parent.left
         anchors.right: chevron.left
         anchors.verticalCenter: parent.verticalCenter
@@ -214,6 +216,7 @@ Item {
               : "transparent"
 
             Text {
+              textFormat: Text.PlainText
               anchors.left: parent.left
               anchors.right: parent.right
               anchors.verticalCenter: parent.verticalCenter