Merge synfig#832: Entry filename extension now corresponds to the sel…

…ected target after saving file. Closes synfig#830.

Thanks to Ankit Kumar Dwivedi.

synfig-studio/src/gui/render.cpp

@@ -223,12 +223,13 @@ RenderSettings::set_entry_filename()
 		else
 			filename+=" ("+canvas->get_name()+')';
 	}
-
-	filename += ".avi";
-
+
 	try
 	{
-		entry_filename.set_text((filename));
+		if(!comboboxtext_target.get_active_row_number())
+			entry_filename.set_text((filename +".avi"));
+		// in case the file was saved and loaded again then .ext should be according to target
+		else on_comboboxtext_target_changed();
 	}
 	catch(...)
 	{