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PR gdb/24502 requests that the "set logging" log file not contain style escape sequences emitted by gdb. This seemed like a reasonable request to me, so this patch implements filtering for the log file. This also updates a comment in ui-style.h that I noticed while writing the patch. Tested on x86-64 Fedora 29. gdb/ChangeLog 2019-06-14 Tom Tromey <tromey@adacore.com> PR gdb/24502: * ui-style.h (skip_ansi_escape): Update comment. * ui-file.h (class no_terminal_escape_file): New class. * ui-file.c (no_terminal_escape_file::write) (no_terminal_escape_file::puts): New methods. * cli/cli-logging.c (handle_redirections): Use no_terminal_escape_file. gdb/testsuite/ChangeLog 2019-06-14 Tom Tromey <tromey@adacore.com> PR gdb/24502: * gdb.base/style-logging.exp: New file.