addressing comments

src/black/lines.py

@@ -606,16 +606,7 @@ def _maybe_empty_lines(self, current_line: Line) -> tuple[int, int]:  # noqa: C9
             # Consume the first leaf's extra newlines.
             first_leaf = current_line.leaves[0]
             before = first_leaf.prefix.count("\n")
-            before = (
-                1
-                if self.previous_line
-                and self.previous_line.is_import
-                and self.previous_line.depth == 0
-                and current_line.depth == 0
-                and not current_line.is_import
-                and Preview.always_one_newline_after_import in self.mode
-                else min(before, max_allowed)
-            )
+            before = min(before, max_allowed)
             first_leaf.prefix = ""
         else:
             before = 0
@@ -680,6 +671,15 @@ def _maybe_empty_lines(self, current_line: Line) -> tuple[int, int]:  # noqa: C9
                 current_line, before, user_had_newline
             )
 
+        if (
+            self.previous_line.is_import
+            and self.previous_line.depth == 0
+            and current_line.depth == 0
+            and not current_line.is_import
+            and Preview.always_one_newline_after_import in self.mode
+        ):
+            return 1, 0
+
         if (
             self.previous_line.is_import
             and not current_line.is_import

tests/data/cases/preview_import_line_collapse.py

@@ -18,6 +18,61 @@
 logger = logging.getLogger(__name__)
 
 
+from middleman.authentication import validate_oauth_token
+
+
+
+logger = logging.getLogger(__name__)
+
+
+# case 4 try catch with import after import
+import os
+import os
+
+
+
+try:
+    import os
+except Exception:
+    pass
+
+try:
+    import os
+    def func():
+        a = 1
+except Exception:
+    pass
+
+
+# case 5 multiple imports
+import os
+import os
+
+import os
+import os
+
+
+
+
+
+for i in range(10):
+    print(i)
+
+
+# case 6 import in function
+def func():
+    print()
+    import os
+    def func():
+        pass
+    print()
+
+
+def func():
+    import os
+    a = 1
+    print()
+
 # output
 
 
@@ -39,3 +94,56 @@
 
 # comment
 logger = logging.getLogger(__name__)
+
+
+from middleman.authentication import validate_oauth_token
+
+logger = logging.getLogger(__name__)
+
+
+# case 4 try catch with import after import
+import os
+import os
+
+try:
+    import os
+except Exception:
+    pass
+
+try:
+    import os
+
+    def func():
+        a = 1
+
+except Exception:
+    pass
+
+
+# case 5 multiple imports
+import os
+import os
+
+import os
+import os
+
+for i in range(10):
+    print(i)
+
+
+# case 6 import in function
+def func():
+    print()
+    import os
+
+    def func():
+        pass
+
+    print()
+
+
+def func():
+    import os
+
+    a = 1
+    print()