speed-up automatic loading (due to unnecessary update of completer)


git-svn-id: http://svn.code.sf.net/p/texstudio/code/trunk@4122 92cce386-e96d-4106-809f-596c673a3fd8
don't update completer (when pressing comma) when it is not really
needed


git-svn-id: http://svn.code.sf.net/p/texstudio/code/trunk@4123 92cce386-e96d-4106-809f-596c673a3fd8