tests: messages: Add test cases for crash bugfix from ZFL 138.

Confirmed as failing, if prior to the contributed bugfix in the previous
commit.

Author: neiljp

tests/ui_tools/test_messages.py

@@ -1301,7 +1301,16 @@ def test_keypress_STREAM_MESSAGE(
                 {"stream": True, "private": True},
                 {"stream": True, "private": True},
                 {"stream": None, "private": None},
-                id="no_msg_body_edit_limit",
+                id="no_msg_body_edit_limit:ZFL<138",
+            ),
+            case(
+                {"sender_id": 1, "timestamp": 1, "subject": "test"},
+                True,
+                None,
+                {"stream": True, "private": True},
+                {"stream": True, "private": True},
+                {"stream": None, "private": None},
+                id="no_msg_body_edit_limit:ZFL>=138",
             ),
             case(
                 {"sender_id": 1, "timestamp": 1, "subject": "(no topic)"},
@@ -1352,7 +1361,16 @@ def test_keypress_STREAM_MESSAGE(
                 {"stream": True, "private": True},
                 {"stream": True, "private": True},
                 {"stream": None, "private": None},
-                id="no_msg_body_edit_limit_with_no_topic",
+                id="no_msg_body_edit_limit_with_no_topic:ZFL<138",
+            ),
+            case(
+                {"sender_id": 1, "timestamp": 45, "subject": "(no topic)"},
+                True,
+                None,
+                {"stream": True, "private": True},
+                {"stream": True, "private": True},
+                {"stream": None, "private": None},
+                id="no_msg_body_edit_limit_with_no_topic:ZFL>=138",
             ),
         ],
     )