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Fix ua issues

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lib/common/iterable.dart

@@ -10,4 +10,58 @@ extension IterableExt<T> on Iterable<T> {
       yield iterator.current;
     }
   }
+
+  Iterable<List<T>> chunks(int size) sync* {
+    if (length == 0) return;
+    var iterator = this.iterator;
+    while (iterator.moveNext()) {
+      var chunk = [iterator.current];
+      for (var i = 1; i < size && iterator.moveNext(); i++) {
+        chunk.add(iterator.current);
+      }
+      yield chunk;
+    }
+  }
+
+  Iterable<T> fill(
+    int length, {
+    required T Function(int count) filler,
+  }) sync* {
+    int count = 0;
+    for (var item in this) {
+      yield item;
+      count++;
+      if (count >= length) return;
+    }
+    while (count < length) {
+      yield filler(count);
+      count++;
+    }
+  }
+}
+
+extension DoubleListExt on List<double> {
+  int findInterval(num target) {
+    if (isEmpty) return -1;
+    if (target < first) return -1;
+    if (target >= last) return length - 1;
+
+    int left = 0;
+    int right = length - 1;
+
+    while (left <= right) {
+      int mid = left + (right - left) ~/ 2;
+
+      if (mid == length - 1 ||
+          (this[mid] <= target && target < this[mid + 1])) {
+        return mid;
+      } else if (target < this[mid]) {
+        right = mid - 1;
+      } else {
+        left = mid + 1;
+      }
+    }
+
+    return -1; // 这行理论上不会执行到，但为了完整性保留
+  }
 }