Designer shortcuts fixes, TaskWindow's copy action fixed

Reverted the commit 59ecb9cf8 which could break wrongly written code
(or the cases like designer).
Fix one of such case (copy action in task window).
Fix synchronization of designer shortcuts by connecting to the
keySequenceChanged() signal of their Command representation.

Reviewed-by: con
Task-number: QTCREATORBUG-471

src/plugins/projectexplorer/taskwindow.cpp

@@ -34,6 +34,7 @@
 #include <coreplugin/editormanager/editormanager.h>
 #include <coreplugin/icore.h>
 #include <coreplugin/uniqueidmanager.h>
+#include <coreplugin/actionmanager/command.h>
 #include <texteditor/basetexteditor.h>
 #include <texteditor/itexteditor.h>
 
@@ -456,9 +457,9 @@ TaskWindow::TaskWindow()
     core->addContextObject(m_taskWindowContext);
 
     m_copyAction = new QAction(QIcon(Core::Constants::ICON_COPY), tr("&Copy"), this);
-    core->actionManager()->
+    Core::Command *command = core->actionManager()->
             registerAction(m_copyAction, Core::Constants::COPY, m_taskWindowContext->context());
-    m_listview->addAction(m_copyAction);
+    m_listview->addAction(command->action());
 
     connect(m_listview->selectionModel(), SIGNAL(currentChanged(const QModelIndex &, const QModelIndex &)),
             tld, SLOT(currentChanged(const QModelIndex &, const QModelIndex &)));