Use a name less likely to conflict

src/textual/__init__.py

@@ -12,7 +12,7 @@ def log(*args: object, verbosity: int = 0, **kwargs) -> None:
     app = active_app.get()
 
     caller = inspect.stack()[1]
-    app.log(*args, verbosity=verbosity, caller=caller, **kwargs)
+    app.log(*args, verbosity=verbosity, _textual_calling_frame=caller, **kwargs)
 
 
 def panic(*args: RenderableType) -> None:

src/textual/app.py

@@ -208,7 +208,7 @@ class App(DOMNode):
         self,
         *objects: Any,
         verbosity: int = 1,
-        caller: inspect.FrameInfo | None = None,
+        _textual_calling_frame: inspect.FrameInfo | None = None,
         **kwargs,
     ) -> None:
         """Write to logs.
@@ -224,11 +224,11 @@ class App(DOMNode):
                 key_values = " ".join(f"{key}={value}" for key, value in kwargs.items())
                 output = " ".join((output, key_values))
 
-            if not caller:
-                caller = inspect.stack()[1]
+            if not _textual_calling_frame:
+                _textual_calling_frame = inspect.stack()[1]
 
-            calling_path = caller.filename
-            calling_lineno = caller.lineno
+            calling_path = _textual_calling_frame.filename
+            calling_lineno = _textual_calling_frame.lineno
 
             if self.devtools.is_connected and verbosity <= self.log_verbosity:
                 if len(objects) > 1 or len(kwargs) >= 1 and output:

src/textual/message_pump.py

@@ -87,7 +87,7 @@ class MessagePump:
         return self._running
 
     def log(self, *args, **kwargs) -> None:
-        return self.app.log(*args, **kwargs, caller=inspect.stack()[1])
+        return self.app.log(*args, **kwargs, _textual_calling_frame=inspect.stack()[1])
 
     def set_parent(self, parent: MessagePump) -> None:
         self._parent = parent