[Bug] StateView not displayed if StateKey property is matched to "None" value

[Kapusch]

Description

Given a StateView "A" with StateKey property defined to "Loading"
and another StateView "B" with StateKey property defined to "None"
and the binded value for CurrentState is defined to "Loading"
When CurrentState value becomes "None"
Then StateView "A" disappears
But StateView "B" does not show up

Steps to Reproduce

1. Run XCT.Sample on iOS
2. Go to the StateLayout example page (Views > StateLayout)
3. Tap the button to launch the States cycle
4. When None state is loaded, the associated StateView is not showing up

Expected Behavior

I was assuming StateView associated to "None" StateKey will appear on screen, is it the normal behavior ?

Actual Behavior

The StateView with StateKey property defined to "None" never show up.

Basic Information

• Version with issue: 1.1.0
• Last known good version: N/A
• IDE: VS for Mac v8.9.3
• Platform Target Frameworks:
  • iOS: iOS 14.4
• Nuget Packages:
  -- Xamarin.Forms 5.0.0.1874,
  -- Xamarin.Essentials 1.5.3.2
• Affected Devices: tested on iPhone Simulator only

Workaround

I have substituted all "None" StateKey into "Success" StateKey

Reproduction imagery

Reproduction Link

XCT_StateView_Not_Appearing.zip

[AndreiMisiukevich]

Is it the same with #1112

if yes, it was fixed in #1122

can you please validate that PR?

[Kapusch]

Hi @AndreiMisiukevich , it looks like the same, indeed... but I have created my repro example from the XCT main branch yesterday, and your fix has been merged 2 days ago.

Otherwise, how could I directly validate the fix provided in the PR please ?

[Kapusch]

I confirm, your fix is already included in the repro sample:

LayoutState previousState = LayoutState.None;

[AndreiMisiukevich]

Duplicate of #1122

[Kapusch]

Sorry @AndreiMisiukevich , what I meant is that your fix was included in my repro sample, and even with that, the bug I have captured in the Gif is still valid.

Am I possibly wrongly using the None state ?

[AndreiMisiukevich]

@Kapusch ah, sorry for the misunderstanding.

is your issue the same with #1032 ?

[Kapusch]

No problem !

I had a look at the issue you are mentioning but no, mine is more about "none stateview never shows up"

But maybe I am not using it right.

[AndreiMisiukevich]

CC @sthewissen

[kerberosargos]

Same thing is for me.