f634a4a0c0 fix(front-component): preserve caret position on controlled input/textarea updates (#20416)
## Problem

In the front-component sandbox, typing in the middle of a pre-filled
`<input>` or `<textarea>` caused the caret to jump to the end on every
keystroke. Characters appeared at the correct position, but editing
mid-string was effectively broken.

Root cause: the remote-DOM bridge round-trips every keystroke through
the
worker. By the time the updated `value` prop arrives back at the host,
React applies it by setting `inputElement.value = X` directly, which
browsers always reset the caret to the end.

Typing at the end was unaffected, which is why this went unnoticed in
search fields and similar append-only inputs.

## Fix

For text-like `<input>` types and `<textarea>`, the `value` prop is now
applied imperatively through a ref callback instead of being passed as a
React controlled prop:

- If the DOM value already matches the incoming prop, the assignment is
  skipped entirely.
- If a write is needed and the element is focused, `selectionStart` and
  `selectionEnd` are captured before the assignment and restored
  afterwards with `setSelectionRange`.

Non-text input types (checkbox, radio, file, color, range) and all other
host elements are unaffected.

## Testing

Drop the repro from the issue into any front-component, click between
two
characters in the pre-filled value, and type — the caret should now stay
at the insertion point.

Fixes #20409

---------

Co-authored-by: Charles Bochet <[email protected]>
2026-05-11 17:47:30 +00:00

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