KeyboardAttachable throws RenderBox exception on Navigator pop.

[pavittarsingh315]

So basically I am using the using the package as so:

@override
  Widget build(BuildContext context) {
    final size = MediaQuery.of(context).size;
    return FooterLayout(
      footer: KeyboardAttachable(
        child: _backButton(context),
      ),
      child: SizedBox(
        height: size.height,
        width: size.width,
        child: const Body(),
      ),
    );
  }

  Widget _backButton(BuildContext context) {
    return TextButton(
      onPressed: () {
        FocusManager.instance.primaryFocus?.unfocus();
        Navigator.of(context).pop();
      },
      child: Text('Go back'),
    );
  }

For some reason, the ``Navigator.of(context).pop();` cause this exception to be thrown:

════════ Exception caught by widgets library ═══════════════════════════════════
The following assertion was thrown building KeyboardAttachable(dirty, dependencies: [MediaQuery], state: _KeyboardAttachableState#8173b(ticker inactive)):
RenderBox was not laid out: RenderFittedBox#193dd NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
'package:flutter/src/rendering/box.dart':
package:flutter/…/rendering/box.dart:1
Failed assertion: line 1979 pos 12: 'hasSize'

2

Either the assertion indicates an error in the framework itself, or we should provide substantially more information in this error message to help you determine and fix the underlying cause.
In either case, please report this assertion by filing a bug on GitHub:
  https://github.com/flutter/flutter/issues/new?template=2_bug.md

The relevant error-causing widget was
KeyboardAttachable

I am really not sure why this is occurring. I have tried to specify a size for the back button the error still occurs.

How can I fix this?

[bdlukaa]

Same here