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## Description This PR exposed `PopupMenuButton.menuPadding` parameter to override the hardcoded value. Credits to @Moluram for the original PR https://github.com/flutter/flutter/pull/81996. And to @arafaysaleem for the update in https://github.com/flutter/flutter/pull/96657. https://github.com/flutter/flutter/pull/96657 was reverted due to a Google testing failure. `PopupMenuButton` implementation has evolved since that time so maybe we will not hit this Google testing failure. And if we do, we will try to figure out what is going on. ## Related Issue Fixes https://github.com/flutter/flutter/issues/143512. Fixes https://github.com/flutter/flutter/issues/57110 ## Tests Adds 2 tests, updates several tests.