RichEditor minRows()/maxRows() support

[pxlrbt]

Description

Textarea natively supports ->rows() but there was no option for RichEditor so far. Since this is not a native feature, I thought it was useful to add both min and max limits. It uses lh unit which is supported in baseline: https://caniuse.com/wf-lh

Visual changes

CleanShot.2026-07-22.at.21.58.29.mp4

Functional changes

• Code style has been fixed by running the composer cs command.
• Changes have been tested to not break existing functionality.
• Documentation is up-to-date.

[danharrin]

Unlike a textarea where line height is fixed, the rich editor has a variety of line heights based on the element used (heading, paragraph) like the markdown editor.

The markdown editor has min/max height, right? So should we not mirror that pattern for the rich editor instead of min/max rows?

[pxlrbt]

You're right, it's probably the better variant. I only compared it to the Textarea and forgot about the MarkdownEditor. I still like the idea of "rows" for a simple RichEditor but I can just pass the 3lh then

[pxlrbt]

The approach I took is a bit different from the markdown editor. While that one works via JS I decided to use plain CSS. Because we need to apply the height restrictions to the content and not the outer field container, I pass them down via CSS vars. Might look a bit weird but works.