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WithFilter lets you supply an event filter that will be invoked before Bubble Tea processes a tea.Msg. The event filter can return any tea.Msg which will then get handled by Bubble Tea instead of the original event. If the event filter returns nil, the event will be ignored and Bubble Tea will not process it. As an example, this could be used to prevent a program from shutting down if there are unsaved changes. Based on the fantastic work by @aschey and supersedes #521. Resolves #472.
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