[Gallery][Android]Flyout(Material) For "Help" section when choose the Nested Flyout for "Settings" the gallery app gets freeze.

[sakshi173]

Current behavior

20210901_140245.mp4

Expected behavior

The Nested flyout for Settings should open properly and app should not get freeze.

How to reproduce it (as minimally and precisely as possible)

1. Open Uno Gallery APP for canary.
2. Click "Flyout" option from Burger Menu.
3. Click “Help” Button in “Nested MenuFlyout ” section.
4. Click/Tap the "Send Feedback" section.
5. Click/Tap the "Settings" section.
6. Observe that the app freeze and tap/click is not working.

Workaround

No response

Works on UWP/WinUI

No response

Environment

No response

NuGet package version(s)

No response

Affected platforms

Android

IDE

No response

IDE version

No response

Relevant plugins

No response

Anything else we need to know?

Canary Build
1.5.0 (400825)
Aug 31, 2021

[Youssef1313]

Related to #4795.

[Xiaoy312]

This happens because nested menu-flyout is unable to light-dismiss:
Given this setup:

           ┌────────┐
[Button]──►│T1 menu │
           ├────────┤
           │T1 item1│  ┌────────┐
           │T1 item2├─►│T2 menu │
           └────────┘  ├────────┤
                       │T2 item1│
                       │T2 item2│
                       └────────┘

when the T1 (tier 1) menu is open, you can still dismiss by clicking any empty space, or complete by pressing the menu items
however, when the nested T2 menu is open, you can no longer light-dismiss by clicking any empty space, or interact with previous menu, but it is still possible to complete by pressing the t2 menu items

the problem here is that, the T3 menu is opened offscreen, effectively locking the option to complete the flyout
you can use the device's native home button or (droid-only)back button to get out of this situation, as alt-tabbing will close any existing flyout

note: normally the flyout should be opened on the left, if the right side will make it offscreen
edit: this issue seems to only manifest on android, other platforms (uwp, ios, wasm) are working correctly

[jeromelaban]

We've made some recent changes, @sakshi173 could you revalidate?

[sakshi173]

@jeromelaban , I revalidated it, and found it, the issue is happening in the below steps.
1.Launch app and go to 'Flyout' Section.
2. Now first time click on 'Settings' options.
3. Notice that the screen is getting hanged.
4. Now tap mobile's back button(2 times)
5. Tap again the 'Settings' option.
6. Notice that now the flyout menu works fine.
Below is the video for the same steps.

flyout.issue_Trim.mp4

[sakshi173]

@jeromelaban, I verified this issue is still present.
Steps to reproduce the bug are below.
1.Launch app and go to 'Flyout' Section.
2. Now first time click on 'Settings' options.
3. Notice that the screen is getting hanged.
4. Now tap mobile's back button(2 times)
5. Tap again the 'Settings' option.
6. Notice that now the flyout menu works fine.

[FrozDark]

Possible related to the size of flyout
#11597

[nguyeenvy]

This issue seems resolved in the latest Uno Gallery app.