TextEditor: get CompletionAssistProvider from editor.

And not from the global object pool. This way, the editors that have
different highlighters for various language dialects, or editors that
support multiple languages in a single editor, can decide themselves on
what CompletionAssistProvider to provide.

Change-Id: Ieebc4a8e7b3de6470fdb8103035aa3b8b2ba6598
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@digia.com>

src/plugins/qmljseditor/qmljseditoreditable.cpp

@@ -30,6 +30,7 @@
 #include "qmljseditoreditable.h"
 #include "qmljseditor.h"
 #include "qmljseditorconstants.h"
+#include "qmljscompletionassist.h"
 
 #include <qmljstools/qmljstoolsconstants.h>
 #include <texteditor/texteditorconstants.h>
@@ -41,6 +42,8 @@
 #include <coreplugin/modemanager.h>
 #include <coreplugin/coreconstants.h>
 
+#include <extensionsystem/pluginmanager.h>
+
 namespace QmlJSEditor {
 
 QmlJSEditor::QmlJSEditor(QmlJSTextEditorWidget *editor)
@@ -65,4 +68,9 @@ const Utils::CommentDefinition *QmlJSEditor::commentDefinition() const
     return &m_commentDefinition;
 }
 
+TextEditor::CompletionAssistProvider *QmlJSEditor::completionAssistProvider()
+{
+    return ExtensionSystem::PluginManager::getObject<Internal::QmlJSCompletionAssistProvider>();
+}
+
 } // namespace QmlJSEditor