FIX: handle negative timeouts in backend_qt's start_event_loop

tacaswell · tacaswell · commit 4fb5993651d1 · 2020-06-11T15:49:29.000-04:00
negative numbers are truthy,  only start timer on positive timeouts.
diff --git a/lib/matplotlib/backends/backend_qt5.py b/lib/matplotlib/backends/backend_qt5.py
@@ -426,7 +426,7 @@ def start_event_loop(self, timeout=0):
         if hasattr(self, "_event_loop") and self._event_loop.isRunning():
             raise RuntimeError("Event loop already running")
         self._event_loop = event_loop = QtCore.QEventLoop()
-        if timeout:
+        if timeout > 0:
             timer = QtCore.QTimer.singleShot(timeout * 1000, event_loop.quit)
         event_loop.exec_()
 
