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toggle-window-split swapped buffers between two windows via two set-window-buffer calls. If either window was strongly dedicated (e.g. *Org Agenda* via the display-buffer-alist rule), the dedicated window rejected the second swap. Both panes ended up showing the dedicated buffer. The non-dedicated buffer never made it across.
The fix clears dedicated on both windows before the swap. The user explicitly invoked a layout change, so preserving per-window dedicated through the operation would just re-trigger the same wedge on the next toggle.
Tests in tests/test-ui-navigation--toggle-window-split.el cover the no-dedicated baseline, the bug-trigger (dedicated selected window), the post-toggle cleared state, and the one-window / three-window no-op boundaries.
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