Add missing type hints

Author: x24git

src/prompt_toolkit/filters/app.py

@@ -178,7 +178,7 @@ def has_any_validation_error() -> bool:
     from prompt_toolkit.layout.controls import UIControl, BufferControl, SearchBufferControl
 
     # Extract buffer validation errors for buffer UIControl children classes
-    def get_buffer_from_content(content: UIControl):
+    def get_buffer_from_content(content: UIControl) -> bool:
         if isinstance(content, (BufferControl, SearchBufferControl)):
             return content.buffer.validation_error is not None
         else:

src/prompt_toolkit/widgets/toolbars.py

@@ -342,7 +342,7 @@ def __pt_container__(self) -> Container:
 
 
 class ValidationToolbar:
-    def __init__(self, show_position: bool = False, buffer: Buffer = None) -> None:
+    def __init__(self, show_position: bool = False, buffer: Buffer | None = None) -> None:
         def get_formatted_text() -> StyleAndTextTuples:
             # If buffer not specified, use the currently focused buffer
             if buffer is None: