Merge pull request #16359 from anntzer/copy-usetex

tacaswell · web-flow · commit 915827632b90 · 2020-01-28T22:12:23.000-05:00
MNT: Make Text.update_from copy usetex state.
diff --git a/doc/api/next_api_changes/behaviour.rst b/doc/api/next_api_changes/behaviour.rst
@@ -70,3 +70,6 @@ shape ``(n, 2)`` would plot the first column of *x* against the first column
 of *y*, the second column of *x* against the second column of *y*, **and** the
 first column of *x* against the third column of *y*.  This now raises an error
 instead.
+
+`.Text.update_from` now copies usetex state from the source Text 
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/lib/matplotlib/tests/test_text.py b/lib/matplotlib/tests/test_text.py
@@ -532,6 +532,21 @@ def test_hinting_factor_backends():
                                rtol=0.1)
 
 
+@needs_usetex
+def test_usetex_is_copied():
+    # Indirectly tests that update_from (which is used to copy tick label
+    # properties) copies usetex state.
+    fig = plt.figure()
+    plt.rcParams["text.usetex"] = False
+    ax1 = fig.add_subplot(121)
+    plt.rcParams["text.usetex"] = True
+    ax2 = fig.add_subplot(122)
+    fig.canvas.draw()
+    for ax, usetex in [(ax1, False), (ax2, True)]:
+        for t in ax.xaxis.majorTicks:
+            assert t.label1.get_usetex() == usetex
+
+
 @needs_usetex
 def test_single_artist_usetex():
     # Check that a single artist marked with usetex does not get passed through
diff --git a/lib/matplotlib/text.py b/lib/matplotlib/text.py
@@ -262,6 +262,7 @@ def update_from(self, other):
         self._verticalalignment = other._verticalalignment
         self._horizontalalignment = other._horizontalalignment
         self._fontproperties = other._fontproperties.copy()
+        self._usetex = other._usetex
         self._rotation = other._rotation
         self._picker = other._picker
         self._linespacing = other._linespacing
