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Fix an infinite loop when using `# fmt: on/off` ... (#3158)
[etc/vim.git] / src / black / lines.py
index e455a5075392e6405b6c2472c371bbce36a7d1d5..8b591c324a5da6a27fc7fb7613f2900df2da9b7b 100644 (file)
@@ -168,6 +168,13 @@ class Line:
             and self.leaves[0].value.startswith(('"""', "'''"))
         )
 
+    @property
+    def opens_block(self) -> bool:
+        """Does this line open a new level of indentation."""
+        if len(self.leaves) == 0:
+            return False
+        return self.leaves[-1].type == token.COLON
+
     def contains_standalone_comments(self, depth_limit: int = sys.maxsize) -> bool:
         """If so, needs to be split before emitting."""
         for leaf in self.leaves:
@@ -513,6 +520,12 @@ class EmptyLineTracker:
         ):
             return before, 1
 
+        if (
+            Preview.remove_block_trailing_newline in current_line.mode
+            and self.previous_line
+            and self.previous_line.opens_block
+        ):
+            return 0, 0
         return before, 0
 
     def _maybe_empty_lines_for_class_or_def(