Merge pull request #12342 from blakejgriffin/sphinximage

Fixed bug on windows where relative image path has wrong slashes

IPython/sphinxext/ipython_directive.py

@@ -419,8 +419,8 b' class EmbeddedSphinxShell(object):'
         # 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]