Rename PluginMgr to DecorationPlugin

It's about the decorations not just *the* plugin.

plugins.cpp

@@ -30,7 +30,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 namespace KWin
 {
 
-PluginMgr::PluginMgr()
+DecorationPlugin::DecorationPlugin()
     : KDecorationPlugins(KGlobal::config())
     , m_noDecoration(false)
 {
@@ -45,24 +45,24 @@ PluginMgr::PluginMgr()
 #endif
 }
 
-void PluginMgr::error(const QString &error_msg)
+void DecorationPlugin::error(const QString &error_msg)
 {
     qWarning("%s", QString(i18n("KWin: ") + error_msg).toLocal8Bit().data());
 
     setNoDecoration(true);
 }
 
-bool PluginMgr::provides(Requirement)
+bool DecorationPlugin::provides(Requirement)
 {
     return false;
 }
 
-void PluginMgr::setNoDecoration(bool noDecoration)
+void DecorationPlugin::setNoDecoration(bool noDecoration)
 {
     m_noDecoration = noDecoration;
 }
 
-bool PluginMgr::hasNoDecoration() const
+bool DecorationPlugin::hasNoDecoration() const
 {
     return m_noDecoration;
 }

plugins.h

@@ -27,11 +27,11 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 namespace KWin
 {
 
-class PluginMgr
+class DecorationPlugin
     : public KDecorationPlugins
 {
 public:
-    PluginMgr();
+    DecorationPlugin();
     virtual bool provides(Requirement);
     /**
      * @returns @c true if there is no decoration plugin.

workspace.cpp

@@ -159,7 +159,7 @@ Workspace::Workspace(bool restore)
     reparseConfigFuture.waitForFinished();
     options->loadConfig();
     options->loadCompositingConfig(false);
-    mgr = new PluginMgr;
+    mgr = new DecorationPlugin;
     default_colormap = DefaultColormap(display(), screen_number);
     installed_colormap = default_colormap;
 

workspace.h

@@ -60,7 +60,7 @@ namespace KWin
 class Client;
 class Outline;
 class RootInfo;
-class PluginMgr;
+class DecorationPlugin;
 class Rules;
 class UserActionsMenu;
 class WindowRules;
@@ -592,7 +592,7 @@ private:
     bool global_shortcuts_disabled;
     bool global_shortcuts_disabled_for_client;
 
-    PluginMgr* mgr;
+    DecorationPlugin* mgr;
 
     RootInfo* rootInfo;
     QWidget* supportWindow;