message: wip(svg): keep text empty space logic
diff: @@ -265,7 +265,8 @@ export function brushSVGTSpan(el: TSpan, scope: BrushScope) {
  'dominant-baseline': 'central',
  'text-anchor': textAlign
  };
  - if (text.match(/\s\s/)) {
  + if (text.match(/\s/)) {
  + // only enabled when have space in text.
  attrs['xml:space'] = 'preserve';
  }
  if (x) {
  