speed up stack

src/textual/app.py

@@ -540,7 +540,7 @@ class App(Generic[ReturnType], DOMNode):
             return
 
         if not _textual_calling_frame:
-            _textual_calling_frame = inspect.stack()[1]
+            _textual_calling_frame = inspect.stack(0)[1]
 
         try:
             if len(objects) == 1 and not kwargs:

src/textual/devtools/redirect_output.py

@@ -39,7 +39,7 @@ class StdoutRedirector:
         if not self.devtools.is_connected:
             return
 
-        caller = inspect.stack()[1]
+        caller = inspect.stack(0)[1]
         self._buffer.append(DevtoolsLog(string, caller=caller))
 
         # By default, `print` adds a "\n" suffix which results in a buffer