Revert "Clipping if only one character text overflows (#99146)" (#102092)

This reverts commit 08e467dd (Google test failures after merge).

packages/flutter/lib/src/painting/text_painter.dart

@@ -586,15 +586,6 @@ class TextPainter {
     return _paragraph!.didExceedMaxLines;
   }
 
-  /// The distance from the left edge of the leftmost glyph to the right edge of
-  /// the rightmost glyph in the paragraph.
-  ///
-  /// Valid only after [layout] has been called.
-  double get longestLine {
-    assert(!_debugNeedsLayout);
-    return _paragraph!.longestLine;
-  }
-
   double? _lastMinWidth;
   double? _lastMaxWidth;
 

packages/flutter/lib/src/rendering/paragraph.dart

@@ -493,12 +493,6 @@ class RenderParagraph extends RenderBox
   @visibleForTesting
   bool get debugHasOverflowShader => _overflowShader != null;
 
-  /// Whether this paragraph currently has overflow and needs clipping.
-  ///
-  /// Used to test this object. Not for use in production.
-  @visibleForTesting
-  bool get debugNeedsClipping => _needsClipping;
-
   void _layoutText({ double minWidth = 0.0, double maxWidth = double.infinity }) {
     final bool widthMatters = softWrap || overflow == TextOverflow.ellipsis;
     _textPainter.layout(
@@ -650,7 +644,7 @@ class RenderParagraph extends RenderBox
     size = constraints.constrain(textSize);
 
     final bool didOverflowHeight = size.height < textSize.height || textDidExceedMaxLines;
-    final bool didOverflowWidth = size.width < textSize.width || size.width < _textPainter.longestLine;
+    final bool didOverflowWidth = size.width < textSize.width;
     // TODO(abarth): We're only measuring the sizes of the line boxes here. If
     // the glyphs draw outside the line boxes, we might think that there isn't
     // visual overflow when there actually is visual overflow. This can become

packages/flutter/test/rendering/paragraph_test.dart

@@ -326,24 +326,6 @@ void main() {
     expect(paragraph.debugHasOverflowShader, isFalse);
   }, skip: isBrowser); // https://github.com/flutter/flutter/issues/61018
 
-  test('one character clip test', () {
-    // Regressing test for https://github.com/flutter/flutter/issues/99140
-    final RenderParagraph paragraph = RenderParagraph(
-      const TextSpan(
-        text: '7',
-        style: TextStyle(fontFamily: 'Ahem', fontSize: 60.0),
-      ),
-      textDirection: TextDirection.ltr,
-      maxLines: 1,
-    );
-
-    // Lay out in a narrow box to force clipping.
-    // The text width is 60 bigger than the constraints width.
-    layout(paragraph, constraints: BoxConstraints.tight(const Size(50.0, 200.0)));
-
-    expect(paragraph.debugNeedsClipping, true);
-  }, skip: isBrowser); // https://github.com/flutter/flutter/issues/61018
-
   test('maxLines', () {
     final RenderParagraph paragraph = RenderParagraph(
       const TextSpan(