fontMap 文本渲染一次绘制一个字符,从而丢弃字体的 OpenType 间距调整。

Describe the bug

When rendering a text layer via LottieAnimationView#setFontMap / LottieDrawable#setFontMap (the path taken whenever the layer isn't exported as glyph shapes), text is drawn one character at a time: TextLayer#drawFontTextLine calls fillPaint.measureText(charString) on a single character, draws it, then manually canvas.translate()s by that character's width before drawing the next one.