fix: support change children via setState

[stonega]

The pr could fix #9 .
Now you can update children via setState out of the resizable widget. I also update the example to show the fix. I am not sure if this is the best solution.
Pleae have a check!
Thanks!

[pideltajah]

After applying these changes to my own project, the UI is indeed updated to reflect state changes but it is no longer resizable. The resize handle shows up and appears correctly but it doesn't do anything. I tried both making the individual changes and also copy/pasted the entire resizable_widget.dart and resizable_widget_controller.dart files.

[stonega]

@pideltajah Have you tried to run the example in my branch? It should work ad expected.

[hacker1024]

After applying these changes to my own project, the UI is indeed updated to reflect state changes but it is no longer resizable. The resize handle shows up and appears correctly but it doesn't do anything. I tried both making the individual changes and also copy/pasted the entire resizable_widget.dart and resizable_widget_controller.dart files.

I have this issue as well.
It looks like this package is a better solution: https://pub.dev/packages/multi_split_view