NTP becomes scrollable and `Load new content` appears when changing device orientation when Brave News disabled

Description

While running through https://github.com/brave/brave-browser/issues/22135 on 1.38.x, I noticed that the NTP page becomes scrollable when changing the orientation from vertical -> horizontal -> vertical and the Load new content button appears via the NTP even though Brave News has never been disabled.

Steps to reproduce

Test Case #1 (in this case, you’ll get the Load new content button appearing)

1. install a version of Brave that has the opt-in card visible by default via NTP (used 1.38.107 Chromium: 101.0.4951.41)
2. disable the Brave News opt-in card via the NTP by pressing the X button
3. once the opt-in card has been disabled, changed the orientation from vertical -> horizontal -> vertical
4. notice that the NTP is scrollable and when you start scrolling, you’ll see the Load new content button appear

Test Case #2 (in this case, the NTP becomes scrollable but the Load new content button does’t appear)

1. install a version of Brave that has the opt-in card visible by default via NTP (used 1.38.107 Chromium: 101.0.4951.41)
2. opt-in into Brave News via the opt-in card under the NTP
3. once enabled, disable Brave News via Settings
4. change the orientation from vertical -> horizontal -> vertical
5. notice that the NTP is scrollable even though Brave News has been disabled

Note: opening a new tab resolves the above. The Load new content button doesn’t appear across different NTP. However, it’s 100% reproducible on every NTP page and only happens when changing orientations.

Actual result

https://user-images.githubusercontent.com/2602313/165386726-fca32b32-58de-4922-9219-ef833eda36bc.mp4

Expected result

Changing the orientation of the device shouldn’t make the NTP tab scrollable nor display the floating Load new content button.

Issue reproduces how often

100% reproducible using the STR/Cases outlined above.

Version/Channel Information:

• Can you reproduce this issue with the current Play Store version? No (1.38.x hasn’t been released yet)
• Can you reproduce this issue with the current Play Store Beta version? Yes
• Can you reproduce this issue with the current Play Store Nightly version? Yes

Device details

• Install type (ARM, x86): ARM
• Device type (Phone, Tablet, Phablet): Samsung S10+
• Android version: Android 12

Brave version

• 1.38.107 Chromium: 101.0.4951.41

Website problems only

• Does the issue resolve itself when disabling Brave Shields? N/A
• Does the issue resolve itself when disabling Brave Rewards? N/A
• Is the issue reproducible on the latest version of Chrome? N/A

Additional information

[kjozwiak]

This needs to be completed for the 1.38.x maintenance release so we can re-enable https://github.com/brave/brave-browser/issues/22135.

[kjozwiak]

Verification PASSED on Samsung S10+ running Android 12 using the following build(s):

Brave | 1.38.118 Chromium: 101.0.4951.67 (Official Build) (64-bit)
--- | ---
Revision | 8888ee7a24e2c36661ddb9536c35b7d4852a3a98-refs/branch-heads/4951@{#1230}
OS | Android 12; Build/SP1A.210812.016

Went through the STR/Cases outlined via https://github.com/brave/brave-browser/issues/22569 and ensured that:

• the NTP isn’t scrollable like before while viewing NTP in both portrait & landscape modes
• ensured that changing the orientation doesn’t display the Load new content button while Brave News is disabled

https://user-images.githubusercontent.com/2602313/168521185-cf15a617-0011-4f3a-b394-ff3c17ce4e36.mp4

https://user-images.githubusercontent.com/2602313/168521140-b99f3837-079d-4b49-9931-15dacecbfea0.mp4

Verification PASSED on Samsung Galaxy Tablet A running Android 11 using the following build(s):

Brave | 1.38.118 Chromium: 101.0.4951.67 (Official Build) (64-bit)
--- | ---
Revision | 8888ee7a24e2c36661ddb9536c35b7d4852a3a98-refs/branch-heads/4951@{#1230}
OS | Android 11; Build/RP1A.200720.012

Went through the STR/Cases outlined via https://github.com/brave/brave-browser/issues/22569 and ensured that:

• the NTP isn’t scrollable like before while viewing NTP in both portrait & landscape modes
• ensured that changing the orientation doesn’t display the Load new content button while Brave News is disabled

https://user-images.githubusercontent.com/2602313/168521499-a7a0a822-61c3-4d85-a06a-518a63f980af.mp4

https://user-images.githubusercontent.com/2602313/168521735-c87d3456-61d8-4bcb-afa2-a9abcfea47bb.mp4