[ui5-textarea]: style regression with growing attribute in High Contrast theme

[zhangliangyi]

Bug Description

When the growing attribute is set on ui5-textarea, the visible input area is incorrectly compressed in High Contrast themes. The rendered height of the textarea's content region appears smaller than expected — the available typing space is visually reduced, likely due to theme-specific CSS custom properties (e.g., border width, padding, or box-sizing overrides) conflicting with the internal height calculation used by the growing resize logic.

Affected Component

ui5-textarea (@ui5/webcomponents)

Expected Behaviour

The behavior should be consistent with what in normal themes.

Isolated Example

No response

Steps to Reproduce

1. Go to https://ui5.github.io/webcomponents/components/TextArea/
2. Switch theme to Horizon High Contrast Black
3. Edit the html in main sample as following

<ui5-textarea placeholder="Type message..." growing growing-max-rows="6"></ui5-textarea>

4. Type multiple lines in the textarea
5. Observe the visible space of the textarea

Log Output, Stack Trace or Screenshots

Priority

High

UI5 Web Components Version

2.17.1 - 2.21.0

Browser

Edge

Operating System

No response

Additional Context

We have received 2 customer incidents about this issue, please triage and fix this issue asap.

Organization

SF

Declaration

• I’m not disclosing any internal or sensitive information.

[tsanislavgatev]

Hi colleagues,

Can you have a look at this?

Best Regards,
Tsanislav

[niyap]

Hello @zhangliangyi,

Thanks for sharing your findings!
Actually, the issue was already reported and fixed with the following pull request #13345 two days ago.
You can test the same sample using the following link: https://ui5.github.io/webcomponents/nightly/components/TextArea/

Kind Regards,
Niya

[github-actions]

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[zhangliangyi]

@niyap
Since there are already 3 customer incidents which reports this style issue, here I request a downport fix version based on 2.17.1.