[Bug gdb/19318] "kill inferior N" and "detach inferior N" commands shouldn't switch to inferior N

["cvs-commit at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=19318

--- Comment #1 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Tankut Baris Aktemur
<aktemur@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=cfaa8f76928803afda1e1862bcd0ab5f7febd647

commit cfaa8f76928803afda1e1862bcd0ab5f7febd647
Author: Tankut Baris Aktemur <tankut.baris.aktemur@intel.com>
Date:   Thu Oct 29 15:33:39 2020 +0100

    gdb: restore thread after detaching or killing an inferior

    The "detach inferiors N" command causes the current inferior to
    switch.  E.g.:

      $ gdb a.out
      Reading symbols from a.out...
      (gdb) start
      ...
      (gdb) add-inferior
      [New inferior 2]
      Added inferior 2 on connection 1 (native)
      (gdb) inferior 2
      [Switching to inferior 2 [<null>] (<noexec>)]
      (gdb) info inferiors
        Num  Description       Connection           Executable
        1    process 18242     1 (native)           /path/to/a.out
      * 2    <null>            1 (native)
      (gdb) detach inferiors 1
      Detaching from program: /path/to/a.out, process 18242
      [Inferior 1 (process 18242) detached]
      (gdb) info inferiors
        Num  Description       Connection           Executable
      * 1    <null>                                 /path/to/a.out
        2    <null>            1 (native)
      (gdb)

    The same switch happens with the "kill inferiors N" command.  Prevent
    it by restoring the current thread.

    gdb/ChangeLog:
    2020-10-29  Tankut Baris Aktemur  <tankut.baris.aktemur@intel.com>

            PR gdb/19318
            * inferior.c (detach_inferior_command): Restore the current thread.
            (kill_inferior_command): Ditto.

    gdb/testsuite/ChangeLog:
    2020-10-29  Tankut Baris Aktemur  <tankut.baris.aktemur@intel.com>

            * gdb.base/kill-detach-inferiors-cmd.exp: Check that 'kill
            inferiors' and 'detach inferiors' do not change the current
            inferior.

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