Test blank lines after nested imports

crates/ruff_linter/resources/test/fixtures/pycodestyle/E30_isort.py

@@ -21,9 +21,10 @@ class BackendProxy:
 
     abcd.foo()
 
-
 def __init__(self, backend_module: str, backend_obj: str | None) -> None: ...
 
+if TYPE_CHECKING:
+    from typing_extensions import TypeAlias
 
 def __call__(self, name: str, *args: Any, **kwargs: Any) -> Any: ...
 

crates/ruff_linter/src/rules/pycodestyle/rules/blank_lines.rs

@@ -669,7 +669,11 @@ impl<'a> BlankLinesChecker<'a> {
                 }
                 LogicalLineKind::Comment => {}
                 LogicalLineKind::Import => {
-                    state.follows = Follows::Import;
+                    state.follows = if logical_line.indent_length == 0 {
+                        Follows::Import
+                    } else {
+                        Follows::Other
+                    }
                 }
                 LogicalLineKind::Other => {
                     state.follows = Follows::Other;

crates/ruff_linter/src/rules/pycodestyle/snapshots/ruff_linter__rules__pycodestyle__tests__blank_lines_E302_isort.snap

@@ -24,4 +24,42 @@ E30_isort.py:1:1: I001 [*] Import block is un-sorted or un-formatted
 6   |-
 7 4 | 
 8 5 | class MissingCommand(TypeError): ...  # noqa: N818
-9 6 |
+9 6 | 
+
+E30_isort.py:24:1: E302 [*] Expected 2 blank lines, found 1
+   |
+22 |     abcd.foo()
+23 | 
+24 | def __init__(self, backend_module: str, backend_obj: str | None) -> None: ...
+   | ^^^ E302
+25 | 
+26 | if TYPE_CHECKING:
+   |
+   = help: Add missing blank line(s)
+
+ℹ Safe fix
+21 21 | 
+22 22 |     abcd.foo()
+23 23 | 
+   24 |+
+24 25 | def __init__(self, backend_module: str, backend_obj: str | None) -> None: ...
+25 26 | 
+26 27 | if TYPE_CHECKING:
+
+E30_isort.py:29:1: E302 [*] Expected 2 blank lines, found 1
+   |
+27 |     from typing_extensions import TypeAlias
+28 | 
+29 | def __call__(self, name: str, *args: Any, **kwargs: Any) -> Any: ...
+   | ^^^ E302
+   |
+   = help: Add missing blank line(s)
+
+ℹ Safe fix
+26 26 | if TYPE_CHECKING:
+27 27 |     from typing_extensions import TypeAlias
+28 28 | 
+   29 |+
+29 30 | def __call__(self, name: str, *args: Any, **kwargs: Any) -> Any: ...
+30 31 | 
+31 32 |

crates/ruff_linter/src/rules/pycodestyle/snapshots/ruff_linter__rules__pycodestyle__tests__blank_lines_E303_isort.snap

@@ -30,6 +30,8 @@ E30_isort.py:22:5: E303 [*] Too many blank lines (3)
    |
 22 |     abcd.foo()
    |     ^^^^ E303
+23 | 
+24 | def __init__(self, backend_module: str, backend_obj: str | None) -> None: ...
    |
    = help: Remove extraneous blank line(s)
 
@@ -41,4 +43,4 @@ E30_isort.py:22:5: E303 [*] Too many blank lines (3)
 21    |-
 22 20 |     abcd.foo()
 23 21 | 
-24 22 |
+24 22 | def __init__(self, backend_module: str, backend_obj: str | None) -> None: ...