QmlDesigner: Fix compilation with namespaced Qt

Task-number: QTCREATORBUG-24544
Change-Id: I9f16bf9a454f5b97ac6581274b0b08421b24c4da
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/qmldesigner/assetexporterplugin/assetexportdialog.h

@@ -39,9 +39,6 @@ class QListView;
 class QPlainTextEdit;
 QT_END_NAMESPACE
 
-namespace Ui {
-class AssetExportDialog;
-}
 
 namespace Utils {
 class OutputFormatter;
@@ -52,6 +49,7 @@ class Task;
 }
 
 namespace QmlDesigner {
+namespace Ui { class AssetExportDialog; }
 class FilePathModel;
 
 class AssetExportDialog : public QDialog

src/plugins/qmldesigner/assetexporterplugin/assetexportdialog.ui

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <ui version="4.0">
- <class>AssetExportDialog</class>
- <widget class="QDialog" name="AssetExportDialog">
+ <class>QmlDesigner::AssetExportDialog</class>
+ <widget class="QDialog" name="QmlDesigner::AssetExportDialog">
   <property name="geometry">
    <rect>
     <x>0</x>

src/plugins/qmldesigner/assetexporterplugin/assetexporterview.h

@@ -83,4 +83,6 @@ private:
 
 }
 
+QT_BEGIN_NAMESPACE
 QDebug operator<<(QDebug os, const QmlDesigner::AssetExporterView::LoadState &s);
+QT_END_NAMESPACE