web-ui: only offer session-drop targets that will really happen - #388
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Dragging a session onto the multiview canvas rendered all five drop zones (open-here plus four splits) unconditionally, with legitimacy decided only inside the drop handlers after the drop. So the UI advertised actions that wouldn't happen: at the pane cap a "Split" drop silently became a tab, and dragging a session already on the canvas showed full zones but any drop just focused its existing pane. The overlay now computes which targets are legitimate before rendering and only offers those, so what the user sees is what the drop will do. Tests cover the cap, the already-open session, and single-view cases.
ReganBell
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Aug 13, 2026
Dragging a session onto the multiview canvas rendered all five drop zones (open-here plus four splits) unconditionally, with legitimacy decided only inside the drop handlers after the drop. So the UI advertised actions that wouldn't happen: at the pane cap a "Split" drop silently became a tab, and dragging a session already on the canvas showed full zones but any drop just focused its existing pane. The overlay now computes which targets are legitimate before rendering and only offers those, so what the user sees is what the drop will do. Tests cover the cap, the already-open session, and single-view cases. **Deployment notes** Builds on the multiview pane work in #1885 (e06ba40af) — land that first or together Web-ui drag/drop UI logic only <!-- codesmith:footer --> --- <a href="https://app.blacksmith.sh/yc-software/codesmith/qm/pr/388"><picture><source media="(prefers-color-scheme: dark)" srcset="https://pr-comments-assets.blacksmith.sh/codesmith/view-with-codesmith-dark-v2.svg"><source media="(prefers-color-scheme: light)" srcset="https://pr-comments-assets.blacksmith.sh/codesmith/view-with-codesmith-light-v2.svg"><img alt="View with [code]smith" src="https://pr-comments-assets.blacksmith.sh/codesmith/view-with-codesmith-dark-v2.svg"></picture></a> <a href="https://backend.blacksmith.sh/track/enable-autofix?expires=1789237832&installation_model_id=19911&pr_number=388&repository=yc-software%2Fqm&return_to=https%3A%2F%2Fgithub.com%2Fyc-software%2Fqm%2Fpull%2F388&signature=255307e27382f83752dda99ea9a7cf5b6fc53bd872c7b581cb28061fe9f1e106"><picture><source media="(prefers-color-scheme: dark)" srcset="https://pr-comments-assets.blacksmith.sh/codesmith/autofix-with-codesmith-dark.svg"><source media="(prefers-color-scheme: light)" srcset="https://pr-comments-assets.blacksmith.sh/codesmith/autofix-with-codesmith-light.svg"><img alt="Autofix with [code]smith" src="https://pr-comments-assets.blacksmith.sh/codesmith/autofix-with-codesmith-dark.svg"></picture></a> <sup>Need help on this PR? Tag <code>@codesmith-bot</code> with what you need. Autofix is disabled.</sup> <!-- codesmith:autofix:disabled --> <!-- /codesmith:footer -->
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Dragging a session onto the multiview canvas rendered all five drop zones (open-here plus four splits) unconditionally, with legitimacy decided only inside the drop handlers after the drop. So the UI advertised actions that wouldn't happen: at the pane cap a "Split" drop silently became a tab, and dragging a session already on the canvas showed full zones but any drop just focused its existing pane. The overlay now computes which targets are legitimate before rendering and only offers those, so what the user sees is what the drop will do. Tests cover the cap, the already-open session, and single-view cases.
Deployment notes
Builds on the multiview pane work in #1885 (e06ba40af) — land that first or together
Web-ui drag/drop UI logic only
Need help on this PR? Tag
@codesmith-botwith what you need. Autofix is disabled.