bpo-39392: Turtle overlap fill depends on OS (GH-18223)
Whether or not overlap regions for self-intersecting polygons
or multiple shapes are filled depends on the operating system graphics,
typeof overlap, and number of overlaps.
(cherry picked from commit 2824c45a0a020f12f27da7e7162e8636c21bf869)
Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>
diff --git a/Doc/library/turtle.rst b/Doc/library/turtle.rst
index 7f9f0c3..fed8504 100644
--- a/Doc/library/turtle.rst
+++ b/Doc/library/turtle.rst
@@ -1051,6 +1051,11 @@
Fill the shape drawn after the last call to :func:`begin_fill`.
+ Whether or not overlap regions for self-intersecting polygons
+ or multiple shapes are filled depends on the operating system graphics,
+ type of overlap, and number of overlaps. For example, the Turtle star
+ above may be either all yellow or have some white regions.
+
.. doctest::
:skipif: _tkinter is None
diff --git a/Misc/NEWS.d/next/Documentation/2020-01-27-18-18-42.bpo-39392.oiqcLO.rst b/Misc/NEWS.d/next/Documentation/2020-01-27-18-18-42.bpo-39392.oiqcLO.rst
new file mode 100644
index 0000000..7158749
--- /dev/null
+++ b/Misc/NEWS.d/next/Documentation/2020-01-27-18-18-42.bpo-39392.oiqcLO.rst
@@ -0,0 +1 @@
+Explain that when filling with turtle, overlap regions may be left unfilled.