[gdb/testsuite] Make Term::wait_for "" match only a prompt
The semantics of Term::wait_for is: ... # Accept some output from gdb and update the screen. WAIT_FOR is # a regexp matching the line to wait for. Return 0 on timeout, 1 # on success. proc wait_for {wait_for} { ... Note that besides the regexp, also a subsequent gdb prompt is matched. I recently used wait_for "" in a few test-cases, thinking that this would match just a prompt, but in fact that's not the case. Fix this in wait_for, and add a corresponding test in gdb.tui/tuiterm-2.exp. Tested on x86_64-linux.
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