Make GUI not rely on bool(), remove BoundWidget.__bool__() (#251)

corrscope/gui/model_bind.py

@@ -195,14 +195,6 @@ class BoundWidget(QWidget):
             if updater != self.cfg2gui:
                 updater()
 
-    def __bool__(self):
-        """
-        qw.QComboBox().__bool__ does not exist,
-        yet bool(qw.QComboBox()) == False.
-        I suspect https://docs.python.org/3/c-api/bool.html is involved.
-        """
-        return True
-
 
 def blend_colors(
     color1: QColor, color2: QColor, ratio: float, gamma: float = 2

corrscope/gui/view_stack.py

@@ -218,8 +218,7 @@ Right = TypeVar("Right", bound=Union[QWidget, QLayout])  # same as WidgetOrLayou
 
 
 class _Both:
-    def __bool__(self):
-        return False
+    pass
 
 
 Both = _Both()
@@ -233,18 +232,18 @@ def widget_pair_inserter(append_widgets: Callable):
         if right_type is Both:
             left = create_element(left_type, parent, kwargs)
             right = Both
-            push = left
+            child = left
         else:
             left = create_element(left_type, parent)
             right = create_element(right_type, parent, kwargs)
-            push = right
+            child = right
 
         if name:
-            (right or left).setObjectName(name)
+            child.setObjectName(name)
 
         left_is_label = isinstance(left, QLabel)
 
-        with stack.push(push):
+        with stack.push(child):
             if right is Both:
                 yield left
             elif left_is_label: