Have a dedicated SendFilePicker component

src/qml/Dialogs/SendFilePicker.qml

@@ -0,0 +1,20 @@
+import QtQuick 2.12
+
+HFileDialogOpener {
+    fill: false
+    dialog.title: qsTr("Select a file to send")
+
+    onFilePicked: {
+        let path = Qt.resolvedUrl(file).replace(/^file:/, "")
+        py.callClientCoro(userId, "send_file", [roomId, path], () => {
+            if (destroyWhenDone) destroy()
+        })
+    }
+
+    onCancelled: if (destroyWhenDone) destroy()
+
+
+    property string userId
+    property string roomId
+    property bool destroyWhenDone: false
+}