Fix render frame lag issue #251
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This PR fixes an issue which regressed the behavior of
draw()to sometimes return early (under heavy conflation). The regression occurred due to a (correct) replacement of a customPromise-closure-capture Rube Goldberg contraption withPromise.withResolvers, but did not update all access of this change to use thepromisefield of the returned struct (and was not caught by TypeScript, because it inherits the behavior from JavaScript to no-opawaita non-awaitable).This PR also adds a test which chaos-scrolls and resets to asset that scroll-initiated renders draw the final scroll position consistently. Additionally, a small randomized timeout has been added to other test models to make sure the results are not dependent on timing issues.