fix: Use UI identity for background change detection in Effect (#23980) (CP: 25.1)#24013
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vaadin-bot merged 1 commit into25.1from Mar 26, 2026
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EffectContext.isBackgroundChange() always returned false for shared signals modified by another user's session because the check only looked at VaadinRequest.getCurrent(), which is non-null on any request thread. Now Effect tracks its owner UI and compares UI.getCurrent() against it, correctly detecting cross-session changes as background changes. Fixes #23979
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This PR cherry-picks changes from the original PR #23980 to branch 25.1.
Original PR description