Fix another corner case (psf#3682)

Here we enable the backtracking to reach preceding leafs even outside the same parent. As long as they are on the same line, it should be fine, as  is supposed to target the whole line.

src/black/comments.py

@@ -315,9 +315,16 @@ def _generate_ignored_nodes_from_fmt_skip(
         siblings: List[LN] = []
         lineno = prev_sibling.get_lineno()
         # We only want siblings from the same line, as fmt: skip targets a line
-        while prev_sibling is not None and prev_sibling.get_lineno() == lineno:
+        while (
+            prev_sibling is not None
+            and prev_sibling.type not in WHITESPACE
+            and prev_sibling.get_lineno() == lineno
+        ):
             siblings.insert(0, prev_sibling)
-            prev_sibling = prev_sibling.prev_sibling
+            preceding = preceding_leaf(prev_sibling)
+            prev = prev_sibling.prev_sibling
+            prev_sibling = preceding if prev is None else prev
+
         yield from siblings
     elif (
         parent is not None and parent.type == syms.suite and leaf.type == token.NEWLINE