Fixes #3906: Incorrect output for rich text in hints and solution

[vrajdesai78]

Explanation

Fixes #3906: Fixed the overall accessibility of Hints and Solution as follows:

• Parse HTML to normal string for content description
• Improved flow of screen reader by removing repetitive content description.
• Changed content description of expand_list_icon and also improve the flow by making expand_list_icon clickable and not clickable based on talkback reader.

Essential Checklist

• The PR title and explanation each start with "Fix #bugnum: " (If this PR fixes part of an issue, prefix the title with "Fix part of #bugnum: ...".)
• Any changes to scripts/assets files have their rationale included in the PR explanation.
• The PR follows the style guide.
• The PR does not contain any unnecessary code changes from Android Studio (reference).
• The PR is made from a branch that's not called "develop" and is up-to-date with "develop".
• The PR is assigned to the appropriate reviewers (reference).

Video for Hints

hints.mp4

Video for Solution

solution.mp4

[vrajdesai78]

@BenHenning @rt4914 CI checks are failing due to some flaky tests. Can you re-run it.

[BenHenning]

Thanks @vrajdesai78. Just had one follow-up comment--PTAL.

[vrajdesai78]

Thanks @vrajdesai78. Just had one follow-up comment--PTAL.

@BenHenning replied to your comment, also can you please re-run CI checks. Thanks

[BenHenning]

Thanks @vrajdesai78! This LGTM. Just waiting on CI.

[oppiabot]

Unassigning @BenHenning since they have already approved the PR.

[BenHenning]

CI is looking good, so I have no other concerns here. I think you just need @rt4914's approval at this point.

[rt4914]

Currently the hint-content and "Hint 1", show/hide all these are getting read-at-once.

Instead the hint-content, ie., Remember .... should be entirely separate from other things like Hint 1 and show/hide

[vrajdesai78]

Currently the hint-content and "Hint 1", show/hide all these are getting read-at-once.

Instead the hint-content, ie., Remember .... should be entirely separate from other things like Hint 1 and show/hide

Thanks @rt4914, I have updated code according to your suggestion. Also, updated video in the description.

[rt4914]

@vrajdesai78 Suggested some more changes based on the current output.

[rt4914]

LGTM, Thanks.