There is a problem with the Bulgarian layout definition which prevents the proper usage of the Right Alt. Its most customary use is as a Right Alt in order to do things like layout switching, third group selecting. etc. The reason for this is the superflous definition of key <RALT> I am attaching the patch. This change has been synchronised with the author of the layouts - Anton Zinoviev. The reason that he has not been added to the CC: filed is that he currently has no account here.
Created attachment 3287 [details] [review] Some unicode tables changes The obvious patch to fix the problem
fixed in xkeyboard-config cvs
Looks like the status wasn't updated when this was fixed. Closing.
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