[Bug tui/17519] New: TUI/curses doesn't work with TERM=dumb

["palves at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=17519

            Bug ID: 17519
           Summary: TUI/curses doesn't work with TERM=dumb
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: tui
          Assignee: unassigned at sourceware dot org
          Reporter: palves at redhat dot com

If one tries to enable the TUI with TERM=dumb (and e.g., from a shell within
emacs), GDB ends up with a clear screen, the cursor is placed at
bottom/rightmost corner of the screen, there's no prompt, typing shows no echo,
and there's no indication of what's going on.
c-x,a gets you out of the TUI, but it's completely non-obvious.

GDB should error out when enabling the TUI if the terminal doesn't have the
necessary capabilities.

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