fix: #1447 Dropdown Hint missing

[mvarendorff2]

Connection with issue(s)

Close #1447

Solution description

The hint is only shown on an InputDecorator based on several states. One thing that has to be set for the hint to show is isEmpty: true, however this was not passed to the decorator from the dropdown field, thus always hiding the hint and label, regardless of contents.

Screenshots or Videos

Repro-Widget (boilerplate omitted for brevity):

FormBuilderDropdown(
  items: const [],
  decoration: InputDecoration(
    label: const Text('Example'),
    hintText: 'Hint is here',
  ),
)

On 10.0.1 this will not render Hint is here. With this PR it will.

To Do

• Read contributing guide
• Check the original issue to confirm it is fully satisfied
• Add solution description to help guide reviewers
• Add unit test to verify new or fixed behaviour
• If apply, add documentation to code properties and package readme

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.88%. Comparing base (483f02f) to head (525f65e).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1493   +/-   ##
=======================================
  Coverage   89.88%   89.88%           
=======================================
  Files          21       21           
  Lines         840      840           
=======================================
  Hits          755      755           
  Misses         85       85           

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[mvarendorff2]

I just realized after the fact that there is a hint property on the FormBuilderDropdown that's supposed to be used for this. I still believe passing the correct isEmpty value is useful for other interactions with InputDecoration though, so I'll keep this open.

[nullsafe84]

@mvarendorff2 yes the hint label doesn't appear in the dropdown how to fix it ?