Fix negative annotations xycoords.

Use top-right as translation reference point when xycoords are given in "point" or "pixel" and x or y are negative. Logic based on _get_xy_legacy removed in a65151b.
matplotlib · myshen · Jan 20, 2015 · Jan 22, 2015 · 162239fe7323831b71973d38c6b9e05855e0d8b8
commit 162239fe7323831b71973d38c6b9e05855e0d8b8
diff --git a/lib/matplotlib/tests/baseline_images/test_text/annotation_negative_coords.pdf b/lib/matplotlib/tests/baseline_images/test_text/annotation_negative_coords.pdf
diff --git a/lib/matplotlib/tests/baseline_images/test_text/annotation_negative_coords.png b/lib/matplotlib/tests/baseline_images/test_text/annotation_negative_coords.png