TF-4013 Fix the issue where recipients cannot be moved during drag & drop and ellipsize the text.

(cherry picked from commit 033ba2aaee3acae9c4adcfd791832e9adee0efdc)

core/lib/core.dart

@@ -64,6 +64,7 @@ export 'presentation/views/text/text_form_field_builder.dart';
 export 'presentation/views/text/input_decoration_builder.dart';
 export 'presentation/views/text/rich_text_builder.dart';
 export 'presentation/views/text/text_overflow_builder.dart';
+export 'presentation/views/text/middle_ellipsis_text.dart';
 export 'presentation/views/responsive/responsive_widget.dart';
 export 'presentation/views/list/tree_view.dart';
 export 'presentation/views/button/icon_button_web.dart';

core/lib/presentation/views/text/middle_ellipsis_text.dart

@@ -0,0 +1,135 @@
+import 'package:flutter/material.dart';
+
+class MiddleEllipsisText extends StatefulWidget {
+  final String text;
+  final TextStyle? style;
+
+  /// Ratio of characters to keep at the start (0–1). Default = 0.5
+  final double keepStartFraction;
+
+  const MiddleEllipsisText(
+    this.text, {
+    super.key,
+    this.style,
+    this.keepStartFraction = 0.5,
+  });
+
+  @override
+  State<MiddleEllipsisText> createState() => _MiddleEllipsisTextState();
+}
+
+class _MiddleEllipsisTextState extends State<MiddleEllipsisText> {
+  // Cache fields
+  String? _cachedText;
+  String? _cachedStyleKey;
+  double? _cachedWidth;
+  String? _cachedResult;
+
+  @override
+  Widget build(BuildContext context) {
+    final style = widget.style ?? DefaultTextStyle.of(context).style;
+    final styleKey = _styleKey(style);
+    final textDir = Directionality.of(context);
+
+    return LayoutBuilder(
+      builder: (context, constraints) {
+        final maxWidth = constraints.maxWidth;
+
+        // Use cached result if nothing changed
+        if (_cachedText == widget.text &&
+            _cachedStyleKey == styleKey &&
+            _cachedWidth == maxWidth) {
+          return Text(
+            _cachedResult!,
+            style: style,
+            maxLines: 1,
+            overflow: TextOverflow.visible,
+          );
+        }
+
+        final truncated = _truncateMiddleByWidth(
+          widget.text,
+          maxWidth,
+          style,
+          textDir: textDir,
+          keepStartFraction: widget.keepStartFraction,
+        );
+
+        // Update cache
+        _cachedText = widget.text;
+        _cachedStyleKey = styleKey;
+        _cachedWidth = maxWidth;
+        _cachedResult = truncated;
+
+        return Text(
+          truncated,
+          style: style,
+          maxLines: 1,
+          overflow: TextOverflow.visible,
+        );
+      },
+    );
+  }
+
+  String _truncateMiddleByWidth(
+    String text,
+    double maxWidth,
+    TextStyle style, {
+    required TextDirection textDir,
+    double keepStartFraction = 0.5,
+  }) {
+    final painter = TextPainter(
+      textDirection: textDir,
+      maxLines: 1,
+    );
+
+    // Measure full text
+    painter.text = TextSpan(text: text, style: style);
+    painter.layout(maxWidth: double.infinity);
+    if (painter.width <= maxWidth) return text;
+
+    // Measure ellipsis width
+    const ellipsis = '...';
+    painter.text = TextSpan(text: ellipsis, style: style);
+    painter.layout(maxWidth: double.infinity);
+    final ellipsisWidth = painter.width;
+
+    if (maxWidth <= ellipsisWidth) return ellipsis;
+
+    // Binary search for best prefix+suffix length
+    int lo = 0, hi = text.length;
+    String best = ellipsis;
+
+    final f = keepStartFraction.clamp(0.0, 1.0);
+
+    double measure(String t) {
+      painter.text = TextSpan(text: t, style: style);
+      painter.layout(maxWidth: double.infinity);
+      return painter.width;
+    }
+
+    while (lo <= hi) {
+      final k = (lo + hi) ~/ 2;
+      int leftLen = (k * f).round().clamp(0, text.length);
+      int rightLen = (k - leftLen).clamp(0, text.length - leftLen);
+
+      final candidate = text.substring(0, leftLen) +
+          ellipsis +
+          text.substring(text.length - rightLen);
+      final width = measure(candidate);
+
+      if (width <= maxWidth) {
+        best = candidate;
+        lo = k + 1;
+      } else {
+        hi = k - 1;
+      }
+    }
+
+    return best;
+  }
+
+  // Cache key based on style properties
+  String _styleKey(TextStyle s) =>
+      '${s.fontFamily}|${s.fontSize}|${s.fontWeight}|${s.fontStyle}|${s.letterSpacing}|${s.wordSpacing}|${s.height}';
+}