Fix: assertrepr_compare should respect dictionary insertion order (Closes #13503)

Author: DavidAGInnovation

src/_pytest/_io/saferepr.py

@@ -77,6 +77,28 @@ def repr_instance(self, x: object, level: int) -> str:
             s = _format_repr_exception(exc, x)
         if self.maxsize is not None:
             s = _ellipsize(s, self.maxsize)
+
+        return s
+
+    def repr_dict(self, x: dict[object, object], level: int) -> str:
+        n = len(x)
+        if n == 0:
+            return "{}"
+        if level <= 0:
+            return "{...}"
+        s = "{"
+        keys = list(x)
+        for i, key in enumerate(keys):
+            if i >= self.maxdict:
+                s += "...}"
+                break
+            if i > 0:
+                s += ", "
+            keyrepr = self.repr1(key, level - 1)
+            valrepr = self.repr1(x[key], level - 1)
+            s += f"{keyrepr}: {valrepr}"
+        else:
+            s += "}"
         return s