Add wxDocManager::FindTemplate() method.

This allows to find the template corresponding to the document of the given
class.

Closes #12170.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@65915 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/docview.h

@@ -363,6 +363,27 @@ public:
     */
     void AssociateTemplate(wxDocTemplate* temp);
 
+    /**
+        Search for a particular document template.
+
+        Example:
+        @code
+           // creating a document instance of the specified document type:
+           m_doc = (MyDoc*)docManager->FindTemplate(CLASSINFO(MyDoc))->
+                        CreateDocument(wxEmptyString, wxDOC_SILENT);
+        @endcode
+
+        @param classinfo
+            Class info of a document class for which a wxDocTemplate had been
+            previously created.
+
+        @return
+            Pointer to a wxDocTemplate, or @NULL if none found.
+
+        @since 2.9.2
+     */
+    wxDocTemplate* FindTemplate(const wxClassInfo* classinfo);
+
     /**
         Closes the specified document.