Merge pull request #12349 from meeseeksmachine/auto-backport-of-pr-12…

…342-on-7.x

Backport PR #12342 on branch 7.x (Fixed bug on windows where relative image path has wrong slashes)

IPython/sphinxext/ipython_directive.py

@@ -419,8 +419,8 @@ def process_image(self, decorator):
         # insert relative path to image file in source 
         # as absolute path for Sphinx
         # sphinx expects a posix path, even on Windows
-        posix_path = pathlib.Path(savefig_dir,filename).as_posix()
-        outfile = '/' + os.path.relpath(posix_path, source_dir)
+        path = pathlib.Path(savefig_dir, filename)
+        outfile = '/' + path.relative_to(source_dir).as_posix()
 
         imagerows = ['.. image:: %s' % outfile]