Fix test_single_test_run_after_ensemble_experiment

Author: andreas-el

tests/ert/ui_tests/gui/test_single_test_run.py

@@ -34,7 +34,7 @@ def test_single_test_run_after_ensemble_experiment(
     qtbot.mouseClick(run_experiment, Qt.LeftButton)
     # The Run dialog opens, wait until done appears, then click done
     run_dialog = wait_for_child(gui, qtbot, RunDialog)
-    qtbot.waitUntil(run_dialog.done_button.isVisible, timeout=100000)
+    qtbot.waitUntil(lambda: not run_dialog.done_button.isHidden(), timeout=100000)
     qtbot.waitUntil(lambda: run_dialog._tab_widget.currentWidget() is not None)
     qtbot.mouseClick(run_dialog.done_button, Qt.LeftButton)