Case insensitive ExtensionFilter

[Andrea Vacondio]

Hi,
I would like to suggest to add a way to make an ExtenstionFilter case
insensitive. On Linux systems, which are case sensitive, the filter is also
case sensitive but if I'm creating a *.something filter, I'm likely
referring to any case combination (something, SOMETHING, SoMenThing etc).
I know I can add all possible combinations to the extensions list but
that's quite cumbersome. As an example the Swing provided
javax.swing.filechooser.FileNameExtensionFilter is case insensitive.
Thanks
Andrea