Fix issue that can' find no overflow(#167,#174))

Author: zmtzawqlp

CHANGELOG.md

@@ -1,6 +1,7 @@
 ## 15.0.1
 
 * Fix issue that setState() causes custom overflow to disappear(#171)
+* Fix issue that can' find no overflow(#167,#174)
 
 ## 15.0.0
 

lib/src/extended/text_overflow_mixin.dart

@@ -455,12 +455,17 @@ mixin TextOverflowMixin on _RenderParagraph {
 
  if (_hasVisualOverflow) {
  // not find
- assert(range.end != maxOffset, 'can\' find no overflow');
+ // assert(range.end != maxOffset, 'can\' find no overflow');
+ final _TextRange pre = range.copyWith();
  range.end = math.min(
- range.end + 1
- // math.max((maxEnd - range.end) ~/ 2, 1)
- ,
- maxOffset);
+ // range.end + 1,
+ range.end + math.max((maxEnd - range.end) ~/ 2, 1),
+ maxOffset,
+ );
+ if (pre == range) {
+ _hasVisualOverflow = false;
+ break;
+ }
  hideWidgets.clear();
  } else {
  // see pre one whether overflow
@@ -477,12 +482,11 @@ mixin TextOverflowMixin on _RenderParagraph {
  } else {
  maxEnd = range.end;
  range.end = math.max(
- range.start,
- maxEnd - 1,
- // math.min(
- // math.max((maxEnd - range.start) ~/ 2, 1),
- // maxEnd)
- );
+ range.start,
+ // maxEnd - 1,
+ math.min(
+ maxEnd - math.max((maxEnd - range.start) ~/ 2, 1), maxEnd));
+
  // if range is not changed, so maybe we should break.
  if (pre == range) {
  _hasVisualOverflow = false;