[TextField, Textarea]: isClearable defaults to true, no default maxRows

[ly-tempel-bitweb]

Problem

1. TextField's isClearable defaults to false. Angular changed its equivalent, tedi-form-field's clearable, to default to true ([FormField]: clearable set once on the form field, shared by DateField and TimeField angular#572).

2. Textarea was previously excluded from clearing on purpose. That decision was recently changed: Textarea must now be clearable like the other form fields ([Textarea]: clearable by default, no default maxRows for autoGrow angular#751).

3. Textarea's maxRows defaults to 12, so an autoGrow textarea stops growing at 12 rows unless the consumer raises the limit.

Solution

• Default isClearable to true on TextField, so a field with a value shows a
  clear button. Pass isClearable={false} to opt out.
• Textarea: make it clearable by default.
  • Stop omitting isClearable, showClearOnInteraction and onClear from
    TextareaProps, and remove the hardcoded isClearable={false}.
  • Pass isClearable={false} to opt out.
• Textarea maxRows: remove the default value.
  • When maxRows isn't set, autoGrow has no row limit. maxHeight still caps
    the height if it's set.
  • When maxRows is set, nothing changes.
• Read-only: hide the clear button when the input is read-only through
  input.readOnly too. showClearButton only checks the readOnly prop, while
  the input renders readOnly={readOnly || input?.readOnly}.
• Table column filters get a clear button with the new default. Clearing
  calls onChange(''), so the filter resets. Add a test that it does.
• DateField, TimeField, DateTimeField and Search already default to clearable,
  so they're unaffected.
• Update the TextField and Textarea stories and docs for the new defaults.

This is a breaking change:

• Text fields and textareas that showed no clear button now show one once they
  have a value.
• autoGrow textareas without maxRows no longer stop at 12 rows.

[ly-tempel-bitweb]

Scope updated:

• Textarea is now clearable by default, with isClearable={false} to opt out. This reverses the earlier decision to exclude Textarea from clearing.
• Textarea maxRows no longer has a default, so autoGrow grows without a limit unless maxRows or maxHeight is set.

The description has been updated.