feat(Common/InvertedMouseArea): check if already exists a `MouseArea` at children root

tests/ui/modules/Common/InvertedMouseArea.qml

@@ -11,18 +11,30 @@ Item {
   id: item
 
   property bool _mouseAlwaysOutside
-  property var _mouseArea
+  property var _mouseArea: null
 
   // When emitted, returns a function to test if the click
   // is on a specific item. It takes only a item parameter.
   signal pressed (var pointIsInItem)
 
   function _createMouseArea () {
+    var parent = Utils.getTopParent(item, true)
+    var mouseArea = Utils.find(parent.children, function (element) {
+      return Utils.qmlTypeof(element, 'QQuickMouseArea')
+    })
+
+    Utils.assert(
+      _mouseArea === mouseArea,
+      'It already exists a different `MouseArea` at window root. (' +
+      '`local mouse area`=' + _mouseArea + ', `root mouse area`=' +
+      mouseArea + ')'
+    )
+
     if (_mouseArea == null) {
       _mouseArea = builder.createObject()
     }
 
-    _mouseArea.parent = Utils.getTopParent(item, true)
+    _mouseArea.parent = parent
     _mouseAlwaysOutside =
       _mouseArea.parent !== Utils.getTopParent(item)
   }

tests/ui/modules/Linphone/Chat/Message.qml

@@ -22,7 +22,6 @@ Item {
     var children = root.children
 
     // Can be the `invertedMouseArea` of other message.
-    // Or another? It's a problem in this case...
     var mouseArea = children[children.length - 1]
 
     if (Utils.qmlTypeof(mouseArea, 'QQuickMouseArea')) {

tests/ui/scripts/Utils/utils.js

@@ -2,6 +2,8 @@
 // Contains many common helpers.
 // ===================================================================
 
+.pragma library
+
 .import 'uri-tools.js' as UriTools
 
 // ===================================================================
@@ -354,3 +356,40 @@ function includes (obj, value, startIndex) {
 
   return false
 }
+
+// -------------------------------------------------------------------
+
+function _indexFinder (array, cb, context) {
+  var length = array.length
+
+  for (var i = 0; i < length; i++) {
+    if (cb(array[index], index, array)) {
+      return i
+    }
+  }
+
+  return -1
+}
+
+function _keyFinder (obj, cb, context) {
+  var keys = Object.keys(obj)
+  var length = keys.length
+
+  for (var i = 0; i < length; i++) {
+    var key = keys[i]
+    if (cb(obj[key], key, obj)) {
+      return key
+    }
+  }
+}
+
+// Get the first matching value in a array or object.
+// The matching value is obtained if `cb` returns true.
+function find (obj, cb, context) {
+  cb = _computeOptimizedCb(cb, context)
+
+  var finder = isArray(obj) ? _indexFinder : _keyFinder
+  var key = finder(obj, cb, context)
+
+  return key != null && key !== -1 ? obj[key] : null
+}