improved performance and battery usage on older devices

lib/extensions/text.dart

@@ -1,16 +1,29 @@
 import 'package:flutter/material.dart';
 
 extension TextExt on Text {
-  Size get size {
-    final textPainter = TextPainter(
+  /// Single-line width as rendered in [context] (honours the text scaler).
+  /// Memoised: chat bubbles measure the same few names and times over and
+  /// over, and every measurement is a full paragraph layout.
+  double measuredWidth(BuildContext context) {
+    final scaler = MediaQuery.textScalerOf(context);
+    final key = (data, style, scaler);
+    final cached = _widthCache[key];
+    if (cached != null) return cached;
+    final painter = TextPainter(
       text: TextSpan(text: data, style: style),
       maxLines: 1,
       textDirection: TextDirection.ltr,
-    )..layout(minWidth: 0, maxWidth: double.infinity);
-    return textPainter.size;
+      textScaler: scaler,
+    )..layout();
+    final width = painter.width;
+    painter.dispose();
+    if (_widthCache.length >= 512) _widthCache.clear();
+    return _widthCache[key] = width;
   }
 }
 
+final Map<(String?, TextStyle?, TextScaler), double> _widthCache = {};
+
 /// Returns the first non-empty (after trim) entry, or '' if none match.
 String firstNonEmpty(List<String?> values) {
   for (final v in values) {