FIX: use locators in adjust_bbox

Author: rcomer

lib/matplotlib/_tight_bbox.py

@@ -23,7 +23,10 @@ def adjust_bbox(fig, bbox_inches, fixed_dpi=None):
     locator_list = []
     sentinel = object()
     for ax in fig.axes:
-        locator_list.append(ax.get_axes_locator())
+        locator = ax.get_axes_locator()
+        if locator is not None:
+            ax.apply_aspect(locator(ax, None))
+        locator_list.append(locator)
         current_pos = ax.get_position(original=False).frozen()
         ax.set_axes_locator(lambda a, r, _pos=current_pos: _pos)
         # override the method that enforces the aspect ratio on the Axes

lib/matplotlib/tests/test_figure.py

@@ -546,13 +546,24 @@ def test_savefig_pixel_ratio(backend):
     assert ratio1 == ratio2
 
 
-def test_savefig_preserve_layout_engine(tmp_path):
+def test_savefig_preserve_layout_engine():
     fig = plt.figure(layout='compressed')
-    fig.savefig(tmp_path / 'foo.png', bbox_inches='tight')
+    fig.savefig(io.BytesIO(), bbox_inches='tight')
 
     assert fig.get_layout_engine()._compress
 
 
+def test_savefig_locate_colorbar():
+    fig, ax = plt.subplots()
+    pc = ax.pcolormesh(np.random.randn(2, 2))
+    cbar = fig.colorbar(pc, aspect=40)
+    fig.savefig(io.BytesIO(), bbox_inches=mpl.transforms.Bbox([[0, 0], [4, 4]]))
+
+    # Check that an aspect ratio has been applied.
+    assert (cbar.ax.get_position(original=True).bounds !=
+            cbar.ax.get_position(original=False).bounds)
+
+
 @mpl.rc_context({"savefig.transparent": True})
 @check_figures_equal(extensions=["png"])
 def test_savefig_transparent(fig_test, fig_ref):