Minor TextPane tidying.

Change-Id: I361eb61fd648dd52a511b96045ea29e98e8510c2
Reviewed-on: http://gerrit.dmdirc.com/3736
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <greg@dmdirc.com>
Tidy suppressions/annotations.

Change-Id: I31a7cf8b846be59ea6905c861310a8d440cbd2b8
Reviewed-on: http://gerrit.dmdirc.com/3738
Reviewed-by: Greg Holmes <greg@dmdirc.com>
Automatic-Compile: DMDirc Build Manager