Should not scroll Brave News feed in background when Customize Dashboard dialog is focused

[stephendonner]

Description

Should not scroll Brave News feed in background when Customize Dashboard dialog is focused (credit to @srirambv for the find 👍 )

Steps to Reproduce

1. install 1.47.19
2. launch Brave
3. open a new-tab page
4. set brave://flags/#brave-news-v2 to Enabled
5. click on Relaunch
6. click on Customize
7. click on Turn on Brave News
8. via Follow, add a bunch of sources and/or channels (so there's a need to scroll the list in the Following pane)
9. hover the mouse/pointer over the Following pane
10. scroll using scroll wheel on mouse/trackpad, etc.
11. when you reach the end of the list, keep scrolling

Actual result:

After scrolling the Following pane's list, you'll start scrolling the Brave News feed in the background

Expected result:

Should probably not scroll the background, too, when a parented-to-current-window dialog is focused?

Reproduces how often:

100%

Brave version (brave://version info)

Version/Channel Information:

• Can you reproduce this issue with the current release? No
• Can you reproduce this issue with the beta channel? Yes
• Can you reproduce this issue with the nightly channel? Yes

cc @srirambv @mattmcalister @rebron @fallaciousreasoning @petemill

[kjozwiak]

The above requires 1.46.102 or higher for 1.46.x verification 👍

[MadhaviSeelam]

Verification PASSED using

Brave | 1.46.102 Chromium: 107.0.5304.110 (Official Build) beta (64-bit)
-- | --
Revision | 2a558545ab7e6fb8177002bf44d4fc1717cb2998-refs/branch-heads/5304@{#1202}
OS | Windows 11 Version 21H2 (Build 22000.1219)

Reproduced in 1.46.99 using original STR for Win 11 x64

2022-11-10_10h55_17.mp4

1. Install 1.46.102
2. launch Brave
3. opened brave://flags in NTP
4. enabled #brave-news-v2
5. clicked on Relaunch
6. clicked on Customize
7. click on Turn on Brave News
8. clicked Follow button to add a bunch of sources and/or channels to scroll the list in the Following pane
9. hovered the mouse/pointer over the Following pane
10. scrolled using scroll wheel on mouse till end of the list and keep scrolling

Confirmed scrolling with the mouse cursor on the customize Brave News dialog - either/both the Discover pane or Following pane on the left did not scroll the page behind/Brave News Feed. Also able to scroll the feed itself when hovered outside the Customize-dialog's UI.

2022-11-10_11h05_10.mp4