fix: trigger refresh from client on hotswap with PUSH #20848
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When PUSH is enabled, Flow Hotswapper uses it to refresh only the affected UIs. However, this can cause issues if Flow views contain code that relies on VaadinRequest thread local, since hotswap refresh start in a background thread. This change defines a client side event listener to trigger the refresh, and uses PUSH only to fires the event. Fixes #20843
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When PUSH is enabled, Flow Hotswapper uses it to refresh only the affected UIs. However, this can cause issues if Flow views contain code that relies on VaadinRequest thread local, since hotswap refresh start in a background thread. This change defines a client side event listener to trigger the refresh, and uses PUSH only to fires the event.
Fixes #20843