Some windows have buttons with buttons or tabs in the header in gdb-many-windows mode, such as "Locals / Registers" or "Breakpoints / Threads". Are they tabs? Can I add a new one next to them?
Buttons.
When gdb-many-windows is not nil, the GDB Breakpoints buffer shares its window with the GDB stream buffer. To switch from one to another, click Mouse-1 on the corresponding button in the title bar. If gdb-show-threads-by-default is not zero, the GDB Threads buffer is shown by default. Source
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