My Emacs configuration https://git.cjennings.net/dotemacs/atom?h=main 2026-05-13T18:27:25+00:00 2026-05-13T18:27:25+00:00 Craig Jennings c@cjennings.net 2026-05-13T18:27:25+00:00 urn:sha1:97f0f8e67fa5aecf3161ce5b45d2bb17d075111e 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.