[Bug tui/28437] New: `fs status` followed by `fs next` fails to switch focus on Mac

["sourceware at fastmail dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=28437

            Bug ID: 28437
           Summary: `fs status` followed by `fs next` fails to switch
                    focus on Mac
           Product: gdb
           Version: 10.1
            Status: UNCONFIRMED
          Severity: minor
          Priority: P2
         Component: tui
          Assignee: unassigned at sourceware dot org
          Reporter: sourceware at fastmail dot com
  Target Milestone: ---

GDB 10.2 installed from macports, NOT 10.1 (but I don't see it in the list)

Switching focus in tui mode breaks.
To repro:

```
$ gdb -tui ./baseq3/cpma/bin/a.out
Reading symbols from ./baseq3/cpma/bin/a.out...
Reading symbols from
/Applications/ioquake3/baseq3/cpma/bin/a.out.dSYM/Contents/Resources/DWARF/a.out...
(gdb) fs status
Focus set to status window.
(gdb) fs next
/opt/local/var/macports/build/_private_tmp_macports-ports_devel_gdb/gdb/work/gdb-10.2/gdb/tui/tui-data.c:116:
internal-error: struct tui_win_info *tui_next_win(struct tui_win_
info *): Assertion `cur_win->can_focus ()' failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n) y

This is a bug, please report it.  For instructions, see:
<https://www.gnu.org/software/gdb/bugs/>.

/opt/local/var/macports/build/_private_tmp_macports-ports_devel_gdb/gdb/work/gdb-10.2/gdb/tui/tui-data.c:116:
internal-error: struct tui_win_info *tui_next_win(struct tui_win_
info *): Assertion `cur_win->can_focus ()' failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Create a core file of GDB? (y or n) yAbort trap: 6 (core dumped)
                                                                [Exit 134
(ABRT)]

```
This works with whatever code is being debugged, I repro with a hello world in
C


ADDITIONAL DETAILS
GDB 10.2 installed from macports
Mac OS X Big Sur 11.6
gcc 11.2.0_1 installed from macports
```
$ uname -a
Darwin macbook 20.6.0 Darwin Kernel Version 20.6.0: Mon Aug 30 06:12:21 PDT
2021; root:xnu-7195.141.6~3/RELEASE_X86_64 x86_64 i386 MacBookPro11,4 Darwin
$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/opt/local/libexec/gcc/x86_64-apple-darwin20/11.2.0/lto-wrapper
Target: x86_64-apple-darwin20
Configured with:
/opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_lang_gcc11/gcc11/work/gcc-11.2.0/configure
--prefix=/opt/local --build=x86_64-apple-darwin20
--enable-languages=c,c++,objc,obj-c++,lto,fortran,jit
--libdir=/opt/local/lib/gcc11 --includedir=/opt/local/include/gcc11
--infodir=/opt/local/share/info --mandir=/opt/local/share/man
--datarootdir=/opt/local/share/gcc-11 --with-local-prefix=/opt/local
--with-system-zlib --disable-nls --program-suffix=-mp-11
--with-gxx-include-dir=/opt/local/include/gcc11/c++/ --with-gmp=/opt/local
--with-mpfr=/opt/local --with-mpc=/opt/local --with-isl=/opt/local
--enable-stage1-checking --disable-multilib --enable-lto
--enable-libstdcxx-time --with-build-config=bootstrap-debug
--with-bugurl=https://trac.macports.org/newticket --enable-host-shared
--disable-tls --with-as=/opt/local/bin/as --with-ld=/opt/local/bin/ld
--with-ar=/opt/local/bin/ar --with-pkgversion='MacPorts gcc11 11.2.0_1'
--with-sysroot=/Library/Developer/CommandLineTools/SDKs/MacOSX11.sdk
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 11.2.0 (MacPorts gcc11 11.2.0_1)
$ gdb
(gdb) show config
(gdb) show config
This GDB was configured as follows:
   configure --host=x86_64-apple-darwin20.6.0
--target=x86_64-apple-darwin20.6.0
             --with-auto-load-dir=:${prefix}/share/auto-load
             --with-auto-load-safe-path=:${prefix}/share/auto-load
             --with-expat
             --with-gdb-datadir=/opt/local/share/gdb (relocatable)
             --with-jit-reader-dir=/opt/local/lib/gdb (relocatable)
             --without-libunwind-ia64
             --without-lzma
             --without-babeltrace
             --without-intel-pt
             --without-mpfr
             --without-xxhash
            
--with-python=/opt/local/Library/Frameworks/Python.framework/Versions/3.9
(relocatable)
            
--with-python-libdir=/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib
(relocatable)
             --without-debuginfod
             --without-guile
             --disable-source-highlight
             --with-separate-debug-dir=/opt/local/lib/debug (relocatable)
```

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