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This removes the last cleanups from the TUI, by using std::string rather than manual memory management. Regression tested against gdb.tui/*.exp on Fedora 26 x86-64. gdb/ChangeLog 2017-10-09 Tom Tromey <tom@tromey.com> * tui/tui-win.c (tui_set_win_height, parse_scrolling_args): Use std::string. * tui/tui-layout.c (enum tui_status): Use std::string.