message: fix: text opacity bug
diff: @@ -146,6 +146,8 @@ function renderPlainText(hostEl, ctx, text, style, rect, prevEl) {
  // Force baseline to be "middle". Otherwise, if using "top", the
  // text will offset downward a little bit in font "Microsoft YaHei".
  ctx.textBaseline = 'middle';
  + // Set text opacity
  + ctx.globalAlpha = style.opacity || 1;
  // Always set shadowBlur and shadowOffset to avoid leak from displayable.
  for (var i = 0; i < SHADOW_STYLE_COMMON_PROPS.length; i++) {
  