🐛 PaneItemExpander is expanding when adding a pane into NavigationView

[AlexisL61]

Describe the bug
When adding a pane into the NavigationView with a setState(), if a PaneItemExpander is open in the footerItems, it will close. When we remove a pane, the PaneItemExpander will open by itself if it was closed.

To Reproduce

• I have made a reproducible project right here : https://github.com/AlexisL61/PaneItemExpander_bugreport
• After starting the project with flutter run, press the filter icon on the bottom left part of the screen for opening it
• Then press the + button in the bottom left part of the screen
• The filter will close by itself
• If you press the + button again, the filter will open by itself

Expected behavior
The PaneItemExpander should not open or close when adding or removing a pane

Additional context
Tested on Windows only for now?

[bdlukaa]

Hmmm, interesting.

The pane item expanders work by index. They are saved to the page storage with their assigned index, so when their index changes, their state is likely to be lost :/

[AlexisL61]

I see.

If I can be of any assistance on this issue, tell me