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FerroUI main: subscription guards - #5
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The submodule moves to FerroUI main at b75373981, where the event, timer, property-observation and other subscription APIs return a Subscription guard that removes its handler when dropped (#423 D4/D5).
The opened handler of the main window, the delayed find of the reader and its theme change handler subscribe for the life of their source: they detach the Subscription guard, which would otherwise remove the handler when it is dropped.
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Moves the FerroUI submodule to main (b75373981), where the subscription APIs return a
Subscriptionguard that removes its handler when dropped (FerroUI #423, D4/D5). The three subscriptions of the app that live as long as their source (the main window'sopened, the reader's delayed find timer and its theme change handler) calldetach();cargo check --workspace --all-targetsreports no unused guard.