Fix a rendering bug with unwanted lines.

Remove the code in CFX_PathData::GetZeroAreaPath() that triggers this
bug. Update the pixel test expectation with the correct rendering.

Bug: pdfium:1374
Change-Id: Ib00127f5b854b248331dcf60779336e3bc5bed6c
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/58492
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>

core/fxge/cfx_pathdata.cpp

diff --git a/core/fxge/cfx_pathdata.cpp b/core/fxge/cfx_pathdata.cpp
index df0ce4d..078a180 100644
--- a/core/fxge/cfx_pathdata.cpp
+++ b/core/fxge/cfx_pathdata.cpp
@@ -30,11 +30,6 @@
          (a.y - b.y) * (c.x - b.x) == (c.y - b.y) * (a.x - b.x);
 }
 
-bool IsClosedFigure(const FX_PATHPOINT& prev, const FX_PATHPOINT& next) {
-  return prev.m_Type == FXPT_TYPE::MoveTo && next.m_Type == FXPT_TYPE::LineTo &&
-         prev.m_Point == next.m_Point && next.m_CloseFigure;
-}
-
 void UpdateLineEndPoints(CFX_FloatRect* rect,
                          const CFX_PointF& start_pos,
                          const CFX_PointF& end_pos,
@@ -423,12 +418,6 @@
       NewPath->AppendPoint(end.m_Point, FXPT_TYPE::LineTo, false);
       continue;
     }
-
-    if (IsClosedFigure(prev, next)) {
-      NewPath->AppendPoint(prev.m_Point, FXPT_TYPE::MoveTo, false);
-      NewPath->AppendPoint(cur.m_Point, FXPT_TYPE::LineTo, false);
-      *bThin = true;
-    }
   }
 
   size_t new_path_size = NewPath->GetPoints().size();

testing/resources/pixel/bug_1374_expected.pdf.0.png

diff --git a/testing/resources/pixel/bug_1374_expected.pdf.0.png b/testing/resources/pixel/bug_1374_expected.pdf.0.png
index 89c3949e..319932a 100644
--- a/testing/resources/pixel/bug_1374_expected.pdf.0.png
+++ b/testing/resources/pixel/bug_1374_expected.pdf.0.png
Binary files differ