qml: FlatButton icon above text, smaller fontsize

electrum/gui/qml/components/controls/FlatButton.qml

@@ -1,6 +1,24 @@
 import QtQuick 2.6
 import QtQuick.Controls 2.15
+import QtQuick.Controls.Material 2.15
+import QtQuick.Controls.impl 2.15
+import QtQuick.Controls.Material.impl 2.15
 
 TabButton {
+    id: control
     checkable: false
+
+    font.pixelSize: constants.fontSizeSmall
+    display: IconLabel.TextUnderIcon
+
+    contentItem: IconLabel {
+        spacing: control.spacing
+        mirrored: control.mirrored
+        display: control.display
+
+        icon: control.icon
+        text: control.text
+        font: control.font
+        color: !control.enabled ? control.Material.hintTextColor : control.down || control.checked ? control.Material.accentColor : control.Material.foreground
+    }
 }