BUG: Line breaks are not generated due to incorrect calculation of te…

…xt leading (#2890)

Closes #2262.

pypdf/_page.py

@@ -1965,7 +1965,8 @@ def process_operation(operator: bytes, operands: List[Any]) -> None:
             elif operator == b"Tw":
                 space_scale = 1.0 + float(operands[0])
             elif operator == b"TL":
-                TL = float(operands[0])
+                scale_x = math.sqrt(tm_matrix[0]**2 + tm_matrix[2]**2)
+                TL = float(operands[0]) * font_size * scale_x
             elif operator == b"Tf":
                 if text != "":
                     output += text  # .translate(cmap)

tests/test_text_extraction.py

@@ -211,3 +211,11 @@ def test_space_position_calculation():
     page = reader.pages[3]
     extracted = page.extract_text()
     assert "Shortly after the Geneva BOF session, the" in extracted
+
+
+def test_text_leading_height_unit():
+    """Tests for #2262"""
+    reader = PdfReader(RESOURCE_ROOT / "toy.pdf")
+    page = reader.pages[0]
+    extracted = page.extract_text()
+    assert "Something[cited]\n" in extracted