Leo input field should start as one line height and expand, allowing multiple lines

[rebron]

Description

Line height for the input field should start off as one line and expand.
And we should allow multiple lines (shift-enter or paste)

Actual result:

Expected result:

Reproduces how often:

Easily.

Brave version (brave://version info)

Version/Channel Information:

• Can you reproduce this issue with the current release? n/a
• Can you reproduce this issue with the beta channel? n/a
• Can you reproduce this issue with the nightly channel? yes

Other Additional Information:

• 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

Miscellaneous Information:

[aguscruiz]

Adding screenshots if necessary:

Initial state

Max height

[stephendonner]

Verified PASSED using

Brave | 1.63.101 Chromium: 120.0.6099.199 (Official Build) nightly (x86_64)
-- | --
Revision | 8d3f0a563e185b6a763cc8e210ab24775dfb9047
OS | macOS Version 14.3 (Build 23D5043d)

Steps:

1. install 1.63.101
2. launched Brave
3. loaded https://www.nbcnews.com/news/us-news/united-finds-bolts-need-tightening-inspections-door-plugs-grounded-boe-rcna132879
4. clicked on Leo in the sidebar
5. clicked on Accept and begin
6. entered the following multi-line set of questions:

What's 4x4?
What's the square root of 16?
What's the square root of 100?
What's the current date and time?
What's the current weather?

7. clicked on the Send message to Leo button
8. waited for the response

Confirmed Leo answered all 5 of my multi-line questions

[kjozwiak]

Removing QA Pass labels as the above will need to be re-checked using 1.62.x. However, used #32062 (comment) as the needed verification to get the above uplifted into 1.62.x.

Adding QA/Blocked for now as the above was merged into cr121-1.62.x via brave/brave-core#21593. Once C121 is merged into 1.62.x via brave/brave-core#21593, we'll unblock the above and mention the needed 1.62.x version for verification 👍

[kjozwiak]

The above requires 1.62.148 or higher for 1.62.x verification 👍

[stephendonner]

Verified PASSED using

Brave | 1.62.149 Chromium: 121.0.6167.75 (Official Build) (x86_64)
-- | --
Revision | ff84587bd70af9fcbcbe59fc5194ca65082759c4
OS | macOS Version 11.7.10 (Build 20G1427)

Steps:

1. installed 1.62.149
2. launched Brave
3. opened a new-tab page
4. opened Leo in the sidebar
5. clicked on Accept and begin
6. pasted the following and clicked return to send to Leo:

What's 4x4?
What's the square root of 16?
What's the square root of 100?
What's the current date and time?
What's the current weather?

7. waited for Leo to answer

Confirmed Leo answered my 5 questions