Remove back button when using end drawer

[gusghrlrl101]

Description

Before

When end drawer opens, close button is showing on leading.

After

When end drawer opens, close button is not shown.

Related Issues

#13601

Tests

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Breaking Change

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[flutter-dashboard]

It looks like this pull request may not have tests. Please make sure to add tests before merging. If you need an exemption to this rule, contact Hixie on the #hackers channel in Chat.

Reviewers: Read the Tree Hygiene page and make sure this patch meets those guidelines before LGTMing.

[darrenaustin]

@gusghrlrl101 thanks for the contribution. Sorry for the delay in review.

To be honest, I am not sure exactly what you are trying to solve with this. What is wrong with the back button showing when you are using a drawer from the right side? I looked at the spec, but I didn't see any guidance on this (other than to not use end drawers for navigation 😄 ). Even if the user sees the back arrow it in the darkened scrim on the left, if they tap on it, it will dismiss the drawer anyway, so I don't see the harm in having it there.

Is there a use case for this that I am missing?

All that said, if we decide to do this, your fix looks good. However, if we do proceed, we will need to have a test added that covers this change (see test/material/app_bar_test.dart).

[gusghrlrl101]

@darrenaustin, Thanks for your reply 😊.

I added test code for AppBar's leading is null when endDrawer exists.

I think it is unnecessary to show the button and it is awkward for user.
As you said, if we touch darkened scrim on the left, endDrawer will disappear. If so, since we can't even press the back button, isn't it more unnecessary?
Opening endDrawer is the meaning of showing the menu rather than the meaning of navigating. So it is awkward from the user's point of view when the back button appears after opening the menu.
Seeing that people have tried to get rid of the button in this issue as well, I think many users feel it is awkward too.
I would appreciate it if you give me any comments.

Thank you 😊.

[gusghrlrl101]

@darrenaustin
I'm sorry to menthion again.
Could you check out my PR again?
Thanks 😊.

[darrenaustin]

Sorry for the lag on this.

I am still not entirely convinced this is that necessary, but it does look like a reasonable implementation and people have been reporting it, so let's go with it.

LGTM. I will push this after they cut a new branch for release (which should be happening soon).

Thanks for the contribution!

[gusghrlrl101]

@darrenaustin
Thank you for your feedback! 😊

[drdDavi]

Would have been great if there was a boolean to disable and enable this new feature, this new behavior broke my app... this new change should not be the default.
Adding the code below to fix several pages...
leading: IconButton(icon: Icon(Icons.close), onPressed: () => Get.back()),

[darrenaustin]

@drdDavi so sorry this broke your app. Can you give us more information on how exactly it did that? How were users even tapping the icon with the drawer open?

[apgapg]

@darrenaustin Before this back button and end drawer button both appeared. But now with 1.22.x, only end drawer button is shown.
This happens only when one sets endDrawer. In rest pages back button is visible