This introduces an iterator class and a range adapter to make it
simpler to iterate over TUI windows.
One explicit iteration remains, in tui-win.c, because that spot is
deleting windows as well.
gdb/ChangeLog
2019-07-17 Tom Tromey <tom@tromey.com>
* tui/tui-wingeneral.h (tui_refresh_all): Update.
* tui/tui-wingeneral.c (make_all_visible): Use foreach.
(tui_refresh_all): Remove "list" parameter. Use foreach.
* tui/tui-win.c (window_name_completer): Use foreach.
(tui_refresh_all_win, tui_rehighlight_all, tui_all_windows_info)
(update_tab_width): Likewise.
* tui/tui-layout.c (show_layout): Update.
* tui/tui-data.h (class tui_window_iterator): New.
(struct all_tui_windows): New.
* tui/tui-data.c (tui_partial_win_by_name): Use foreach.
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