This is a minor improvement to prevent the Thunderlink handler from showing up in menus. The FreeDesktop spec has this to say:
NoDisplay means "this application exists, but don't display it in the menus". This can be useful to e.g. associate this application with MIME types, so that it gets launched from a file manager (or other apps), without having a menu entry for it (there are tons of good reasons for this, including e.g. the netscape -remote, or kfmclient openURL kind of stuff).
I don't think opening Thunderbird from a menu via the Thunderlink handler is likely to cause any issues, but I find it less confusing when the handler is hidden.
This is a minor improvement to prevent the Thunderlink handler from showing up in menus. The FreeDesktop spec has this to say:
I don't think opening Thunderbird from a menu via the Thunderlink handler is likely to cause any issues, but I find it less confusing when the handler is hidden.