From 106b34180b4a276c6f2ce9fd071d408205da478d Mon Sep 17 00:00:00 2001
From: Tim Hoffmann <2836374+timhoffm@users.noreply.github.com>
Date: Wed, 5 Sep 2018 23:51:56 +0200
Subject: [PATCH] Backport PR #12022: Remove intent to deprecate
 rcParams["backend_fallback"].

---
 lib/matplotlib/pyplot.py | 35 +++++++++++------------------------
 1 file changed, 11 insertions(+), 24 deletions(-)

diff --git a/lib/matplotlib/pyplot.py b/lib/matplotlib/pyplot.py
index 265ca857ef88..3ab2a6549e7a 100644
--- a/lib/matplotlib/pyplot.py
+++ b/lib/matplotlib/pyplot.py
@@ -72,26 +72,6 @@
 _log = logging.getLogger(__name__)
 
 
-## Backend detection ##
-
-
-# FIXME: Deprecate.
-def _backend_selection():
-    """
-    If rcParams['backend_fallback'] is true, we will check (at backend
-    load-time) to see if the current backend is compatible with the current
-    running event loop, and if not switches to a compatible one.
-    """
-    if rcParams["backend_fallback"]:
-        if (dict.__getitem__(rcParams, "backend") in _interactive_bk
-                and _get_running_interactive_framework()):
-            dict.__setitem__(
-                rcParams, "backend", rcsetup._auto_backend_sentinel)
-
-
-_backend_selection()
-
-
 ## Global ##
 
 
@@ -2380,16 +2360,23 @@ def _autogen_docstring(base):
     return lambda func: addendum(docstring.copy_dedent(base)(func))
 
 
-# just to be safe.  Interactive mode can be turned on without
+# If rcParams['backend_fallback'] is true, and an interactive backend is
+# requested, ignore rcParams['backend'] and force selection of a backend that
+# is compatible with the current running interactive framework.
+if (rcParams["backend_fallback"]
+        and dict.__getitem__(rcParams, "backend") in _interactive_bk
+        and _get_running_interactive_framework()):
+    dict.__setitem__(rcParams, "backend", rcsetup._auto_backend_sentinel)
+# Set up the backend.
+switch_backend(rcParams["backend"])
+
+# Just to be safe.  Interactive mode can be turned on without
 # calling `plt.ion()` so register it again here.
 # This is safe because multiple calls to `install_repl_displayhook`
 # are no-ops and the registered function respect `mpl.is_interactive()`
 # to determine if they should trigger a draw.
 install_repl_displayhook()
 
-# Set up the backend.
-switch_backend(rcParams["backend"])
-
 
 ################# REMAINING CONTENT GENERATED BY boilerplate.py ##############