Make file browser dialog movable

interface/resources/qml/dialogs/FileDialog.qml

@@ -30,6 +30,7 @@ ModalWindow {
     implicitHeight: 480
 
     minSize: Qt.vector2d(300, 240)
+    draggable: true
 
     HifiConstants { id: hifi }
 

interface/resources/qml/windows-uit/DefaultFrame.qml

@@ -42,7 +42,7 @@ Frame {
         }
         radius: hifi.dimensions.borderRadius
 
-        // Allow dragging of the window
+        // Enable dragging of the window
         MouseArea {
             anchors.fill: parent
             drag.target: window

interface/resources/qml/windows-uit/ModalFrame.qml

@@ -42,6 +42,13 @@ Frame {
         radius: hifi.dimensions.borderRadius
         color: hifi.colors.faintGray
 
+        // Enable dragging of the window
+        MouseArea {
+            anchors.fill: parent
+            drag.target: window
+            enabled: window.draggable
+        }
+
         Item {
             visible: frameContent.hasTitle
             anchors.fill: parent

interface/resources/qml/windows-uit/ModalWindow.qml

@@ -14,11 +14,13 @@ import "."
 
 Window {
     id: window
-    anchors.centerIn: parent
     modality: Qt.ApplicationModal
     destroyOnCloseButton: true
     destroyOnInvisible: true
-    frame: ModalFrame{}
+    frame: ModalFrame { }
 
     property int colorScheme: hifi.colorSchemes.light
+    property bool draggable: false
+
+    anchors.centerIn: draggable ? undefined : parent
 }