From 884055db78a41e5166d5b74c9af85cf00a12bde0 Mon Sep 17 00:00:00 2001
From: troethe <thomas@43t.de>
Date: Sun, 6 Aug 2023 17:06:42 +0200
Subject: [PATCH] FIXUP: Make tm_prev a tm_matrix, not a product of tm*cm

---
 pypdf/_page.py                     | 2 +-
 pypdf/_text_extraction/__init__.py | 7 ++++---
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/pypdf/_page.py b/pypdf/_page.py
index 01c5b0506..edbf5228d 100644
--- a/pypdf/_page.py
+++ b/pypdf/_page.py
@@ -1926,7 +1926,7 @@ def _extract_text(
             1.0,
             0.0,
             0.0,
-        ]  # will store cm_matrix * tm_matrix
+        ]  # will store previous tm_matrix
         char_scale = 1.0
         space_scale = 1.0
         _space_width: float = 500.0  # will be set correctly at first Tf
diff --git a/pypdf/_text_extraction/__init__.py b/pypdf/_text_extraction/__init__.py
index f93cba45a..dbacd5696 100644
--- a/pypdf/_text_extraction/__init__.py
+++ b/pypdf/_text_extraction/__init__.py
@@ -99,10 +99,11 @@ def crlf_space_check(
     visitor_text: Optional[Callable[[Any, Any, Any, Any, Any], None]],
     spacewidth: float,
 ) -> Tuple[str, str, List[float]]:
+    m_prev = mult(tm_prev, cm_matrix)
     m = mult(tm_matrix, cm_matrix)
     orientation = orient(m)
-    delta_x = m[4] - tm_prev[4]
-    delta_y = m[5] - tm_prev[5]
+    delta_x = m[4] - m_prev[4]
+    delta_y = m[5] - m_prev[5]
     k = math.sqrt(abs(m[0] * m[3]) + abs(m[1] * m[2]))
     f = font_size * k
     if orientation not in orientations:
@@ -186,7 +187,7 @@ def crlf_space_check(
                 text += " "
     except Exception:
         pass
-    tm_prev = m
+    tm_prev = tm_matrix.copy()
     return text, output, tm_prev