fix first line of each cell being ignored for all rules in notebooks.

crates/ruff_linter/resources/test/fixtures/pycodestyle/E30.ipynb

@@ -185,8 +185,7 @@
     "# Ok\n",
     "def function1():\n",
     "\tpass\n",
-    "\n",
-    " "
+    "\n"
    ]
   },
   {
@@ -195,7 +194,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    " \n",
+    "\n",
     "def function2():\n",
     "\tpass\n",
     "# end"

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

@@ -747,10 +747,7 @@ impl<'a> BlankLinesChecker<'a> {
             state.class_status.update(&logical_line);
             state.fn_status.update(&logical_line);
 
-            // Ignore the first logical line (and any comment preceding it) of each cell in notebooks.
-            if !logical_line.is_beginning_of_cell {
-                self.check_line(&logical_line, &state, prev_indent_length, diagnostics);
-            }
+            self.check_line(&logical_line, &state, prev_indent_length, diagnostics);
 
             match logical_line.kind {
                 LogicalLineKind::Class => {
@@ -872,6 +869,8 @@ impl<'a> BlankLinesChecker<'a> {
             && !self.source_type.is_stub()
             // Do not expect blank lines before the first logical line.
             && state.is_not_first_logical_line
+            // Ignore the first logical line (and any comment preceding it) of each cell in notebooks.
+            && !line.is_beginning_of_cell
         {
             // E302
             let mut diagnostic = Diagnostic::new(
@@ -986,6 +985,8 @@ impl<'a> BlankLinesChecker<'a> {
             && !line.kind.is_class_function_or_decorator()
             // Blank lines in stub files are used for grouping, don't enforce blank lines.
             && !self.source_type.is_stub()
+            // Ignore the first logical line (and any comment preceding it) of each cell in notebooks.
+            && !line.is_beginning_of_cell
         {
             // E305
             let mut diagnostic = Diagnostic::new(

crates/ruff_linter/src/rules/pycodestyle/snapshots/ruff_linter__rules__pycodestyle__tests__blank_lines_E305_notebook.snap

@@ -1,22 +1,22 @@
 ---
 source: crates/ruff_linter/src/rules/pycodestyle/mod.rs
 ---
-E30.ipynb:47:1: E305 [*] Expected 2 blank lines after class or function definition, found (1)
+E30.ipynb:55:1: E305 [*] Expected 2 blank lines after class or function definition, found (1)
    |
-46 |     # another comment
-47 | fn()
+54 |     # another comment
+55 | fn()
    | ^^ E305
-48 | # end
-49 | # E306:3:5
+56 | # end
+57 | # E306:3:5
    |
    = help: Add missing blank line(s)
 
 ℹ Safe fix
-44 44 |     # comment
-45 45 | 
-46 46 |     # another comment
-   47 |+
-   48 |+
-47 49 | fn()
-48 50 | # end
-49 51 | # E306:3:5
+52 52 |     # comment
+53 53 | 
+54 54 |     # another comment
+   55 |+
+   56 |+
+55 57 | fn()
+56 58 | # end
+57 59 | # E306:3:5