Composer scrollbar: invisible unless really needed

src/qml/Base/HScrollableTextArea.qml

@@ -2,15 +2,18 @@ import QtQuick 2.12
 import QtQuick.Controls 2.12
 
 ScrollView {
+    id: scrollView
+    clip: true
+    ScrollBar.vertical.visible: contentHeight > height
+
+
+    default property alias textAreaData: textArea.data
+
     property alias backgroundColor: textAreaBackground.color
     property alias placeholderText: textArea.placeholderText
     property alias text: textArea.text
     property alias area: textArea
 
-    default property alias textAreaData: textArea.data
-
-    id: scrollView
-    clip: true
 
     TextArea {
         id: textArea

src/qml/Chat/Composer.qml

@@ -63,16 +63,16 @@ Rectangle {
         }
 
         HScrollableTextArea {
-            Layout.fillHeight: true
-            Layout.fillWidth: true
-            Layout.topMargin: Math.max(0, composer.Layout.minimumHeight - 34)
-
             id: areaScrollView
             placeholderText: qsTr("Type a message...")
             backgroundColor: "transparent"
             area.tabStopDistance: 4 * 4  // 4 spaces
             area.focus: true
 
+            Layout.fillHeight: true
+            Layout.fillWidth: true
+
+
             function setTyping(typing) {
                 py.callClientCoro(
                     writingUserId,