[Bug tui/31522] TUI misses highlight after run to main

["pedro at palves dot net" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31522

--- Comment #8 from Pedro Alves <pedro at palves dot net> ---
Thanks!  Indeed, I played a bit with that patch, and the centering seems to
work just like it did before, in all the use cases I threw at it.  Tromey's
change is also needed for the highlight.

The old code did:

-  if (deprecated_safe_get_selected_frame ())
-    tui_show_frame_info (deprecated_safe_get_selected_frame ());
-  else
-    tui_display_main ();

and I wondered whether we need that tui_display_main call, but I couldn't spot
a behavior difference without it.  I tried enabling the TUI before starting the
program, with and without using "list foo" to move the current source position
elsewhere.

IMO, it would be nice if we centered in more cases, like after "frame", for
example, or before running the program and you enable the TUI (TUI shows main),
but those are not regressions AFAICT.

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