[Textarea] Autosize causes visual jump

[olegpolyakov]

Component

Textarea

Problem

File: Textarea.tsx lines 153-156

Autosize function sets height to 0 first:

function autosizeTextarea(textarea: HTMLTextAreaElement) {
    textarea.style.height = '0px';  // Causes visual jump
    textarea.style.height = textarea.scrollHeight + 'px';
}

Suggested Fix

textarea.style.height = 'auto';
textarea.style.height = \`\${textarea.scrollHeight}px\`;

Or use a hidden mirror element.

Impact

Visual flickering when typing