parallel sets: fix duplicate navbar on parallel tab reopen - #1366
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When the parallel tab was closed and reopened, navbar_parallel.button_sets still pointed to the destroyed widget. On recreation, a second button was added to the new navbar causing a duplicate navigation bar. Fix: reset navbar_parallel.button_sets to NULL in on_parallel_tab_destroy so it is properly recreated on next open.
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When the parallel tab was closed and reopened, navbar_parallel.button_sets still pointed to the destroyed widget. On recreation, a second button was added to the new navbar causing a duplicate navigation bar.
Fix: reset navbar_parallel.button_sets to NULL in on_parallel_tab_destroy so it is properly recreated on next open.