tri state checkboxes are probably a terrible idea

katrain/gui.kv

@@ -682,6 +682,7 @@
         color: LIGHTGREY
 
 
+
 <AnalysisToggle>:
     adaptive_width: True
     spacing: CP_SPACING
@@ -697,15 +698,18 @@
         color: checkbox.disabled_color if root.disabled else (checkbox.selected_color if checkbox.active else checkbox.unselected_color)
         size_hint_x: None
         width: self.texture_size[0] + 4
-        on_left_press: checkbox.active = not checkbox.active
-    MDCheckbox:
+        on_left_press: checkbox.trigger_action()
+    TriStateMDCheckbox:
         id: checkbox
         disabled: root.disabled
+        tri_state: root.tri_state
         size_hint: None,0.5
         pos_hint: {'center_y': 0.5}
         width: self.height
         active: root.default_active
         on_active: if app.gui: app.gui.update_state()
+        on_slashed: if app.gui: app.gui.update_state()
+
 
 <AnalysisMenuItem@MenuItem>:
     on_close: app.gui.analysis_controls.close_dropdown()
@@ -794,6 +798,7 @@
             AnalysisToggle:
                 id: eval
                 text: i18n._("analysis:dots")
+                tri_state: True
             AnalysisToggle:
                 id: hints
                 text: i18n._("analysis:topmoves")