fluttertext省略号
修改源码：
case TextOverflow.ellipsis:
assert(textDirection != null);
_needsClipping = true;
final TextPainter fadeSizePainter = TextPainter(
text: TextSpan(style: _style, text: '\u2026'),
textDirection: textDirection,
textScaleFactor: textScaleFactor,
textstyle
locale: locale,
)..layout();
if (!didOverflowWidth){
final double fadeEnd = size.height;
final int lines = fadeEnd~/fadeSizePainter.height;
_textPainter.maxLines = lines;
}
_overflowShader = null;
break;

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