Tooltips will no longer be added to the screen if that message is already being displayed. This prevents the same message (e.g. the ready room F4 message) from appearing multiple times if the player keeps pressing F4.
Change CRLF to LF in repo.
git-svn-id: https://unknownworlds.svn.cloudforge.com/ns1@1 67975925-1194-0748-b3d5-c16f83f1a3a1