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| Problem | Before | After | | --- | --- | --- | | Width | <img width="797" alt="Screenshot 2024-02-09 at 1 29 09 PM" src="https://github.com/flutter/flutter/assets/389558/c49fa584-2550-41f6-ab80-6c20d01412b1"> | <img width="794" alt="Screenshot 2024-02-09 at 1 23 59 PM" src="https://github.com/flutter/flutter/assets/389558/1326f797-9883-4916-9de3-1939e7648d46"> | | Overflow |  |  | Fixes https://github.com/flutter/flutter/issues/78746 Fixes https://github.com/flutter/flutter/issues/92851 Part of https://github.com/flutter/flutter/issues/101620 Fixes https://github.com/flutter/flutter/issues/147483 Fixes https://github.com/flutter/flutter/issues/153274 Part of Google b/317115348 Fixes optionsViewOpenDirection not working, mentioned in https://github.com/flutter/flutter/pull/143249#issuecomment-2036191457. ### Requirements * [x] By default, the width of the options matches the width of the field. * [x] Options can be aligned to the start or end for LTR/RTL languages. * [x] The optionsViewOpenDirection parameter is respected. * [x] If the options would vertically exceed the top or bottom of the screen, they reposition themselves to fit on the screen while covering the field. At least enough to tap an option. This has accessibility implications, because sometimes an Autocomplete near the edge of a narrow screen can be unusable. * [x] If the Autocomplete is in a ScrollView, then the options move along with the field during scrolling. * [x] When the field moves or resizes, the options position and size change to match. Even if the field is animated. * [ ] The options layout updates on the same frame that the field layout changes. It's probably not possible to check all of these boxes so we'll probably need to compromise. #### Tools that I've used to try to achieve this * LayoutBuilder to provide the field constraints[^1]. * Looking up layout information of a widget via GlobalKey. * CompositedTransformFollower/Target. * CustomSingleChildLayout. [^1]: Originally this didn't work due to a bug when using LayoutBuilder with OverlayPortal (https://github.com/flutter/flutter/pull/147856). That has now been fixed. Co-authored-by: Victor Sanni <victorsanniay@gmail.com>
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