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This commit was inspired by this mailing list patch: https://sourceware.org/pipermail/gdb-patches/2021-January/174713.html Currently, calling tui_layout_window::apply will add the window from the layout object to the global tui_windows list. Unfortunately, when the user runs the 'winheight' command, this calls tui_adjust_window_height, which calls the tui_layout_base::adjust_size function, which can then call tui_layout_base::apply. The consequence of this is that when the user does 'winheight' duplicate copies of a window can be added to the global tui_windows list. The original patch fixed this by changing the apply function to only update the global list some of the time. This patch takes a different approach. The apply function no longer updates the global tui_windows list. Instead a new virtual function is added to tui_layout_base which is used to gather all the currently applied windows into a vector. Finally tui_apply_current_layout is updated to make use of this new function to update the tui_windows list. The benefits I see in this approach are, (a) the apply function now no longer touches global state, this solves the immediate problem, and (b) now that tui_windows is updated directly in the function tui_apply_current_layout, we can drop the saved_tui_windows global. gdb/ChangeLog: * tui-layout.c (saved_tui_windows): Delete. (tui_apply_current_layout): Don't make use of saved_tui_windows, call new get_windows member function instead. (tui_get_window_by_name): Check in tui_windows. (tui_layout_window::apply): Don't add to tui_windows. * tui-layout.h (tui_layout_base::get_windows): New member function. (tui_layout_window::get_windows): Likewise. (tui_layout_split::get_windows): Likewise. gdb/testsuite/ChangeLog: * gdb.tui/winheight.exp: Add more tests.