Fix nested completer which got broken in previous 'get_word_before_cursor' fix (#2034)

* Fix nested completer which got broken in previous 'get_word_before_cursor' fix.
* Ruff-related fixes.
* Fix typing issue in dialogs.py.

Author: jonathanslenders

src/prompt_toolkit/document.py

@@ -457,10 +457,11 @@ def get_word_before_cursor(
     def _is_word_before_cursor_complete(
         self, WORD: bool = False, pattern: Pattern[str] | None = None
     ) -> bool:
-        if not self.text_before_cursor == "" or self.text_before_cursor[-1:].isspace():
+        if self.text_before_cursor == "" or self.text_before_cursor[-1:].isspace():
             return True
         if pattern:
             return self.find_start_of_previous_word(WORD=WORD, pattern=pattern) is None
+        return False
 
     def find_start_of_previous_word(
         self, count: int = 1, WORD: bool = False, pattern: Pattern[str] | None = None

src/prompt_toolkit/shortcuts/dialogs.py

@@ -1,7 +1,6 @@
 from __future__ import annotations
 
 import functools
-from asyncio import get_running_loop
 from typing import Any, Callable, Sequence, TypeVar
 
 from prompt_toolkit.application import Application
@@ -290,8 +289,10 @@ def set_percentage(value: int) -> None:
         app.invalidate()
 
     def log_text(text: str) -> None:
-        app.loop.call_soon_threadsafe(text_area.buffer.insert_text, text)
-        app.invalidate()
+        loop = app.loop
+        if loop is not None:
+            loop.call_soon_threadsafe(text_area.buffer.insert_text, text)
+            app.invalidate()
 
     # Run the callback in the executor. When done, set a return value for the
     # UI, so that it quits.

tests/test_document.py

@@ -1,8 +1,9 @@
 from __future__ import annotations
 
-import pytest
 import re
 
+import pytest
+
 from prompt_toolkit.document import Document
 
 
@@ -77,4 +78,4 @@ def test_get_word_before_cursor_with_whitespace_and_pattern():
     assert document.get_word_before_cursor() == ""
 
     _FIND_WORD_RE = re.compile(r"([a-zA-Z0-9_]+|[^a-zA-Z0-9_\s]+)")
-    assert document.get_word_before_cursor(pattern=_FIND_WORD_RE) == ""
+    assert document.get_word_before_cursor(pattern=_FIND_WORD_RE) == ""