fixed the Q-Reg spec machine used for implementing S^EGq$ (match one of characters in Q-Register)

* It was initialized only once, so it could inherit the wrong local Q-Register table.
  A test case has been added for this particular bug.
* Also, if starting from the profile (batch mode), the state machine could be initialized
  without undo, which then later cause problems on rubout in interactive mode.
  For instance, if S^EG[a] fails and you would repeatedly type `]`, the Q-Reg name could
  grow indefinitely. There were probably other issues as well.
  Even crashes should have been possible, although I couldn't reproduce them.
* Since the state machine is required only for the pattern to regexp translation
  and is performed anew for every character in interactive mode,
  we now create a fresh state machine for every call and don't attempt
  any undo.
  There might be more efficient ways, like reusing the string building's
  Q-Reg parser state machine.

0 files changed, 0 insertions, 0 deletions