trust + fix redraw bug

core/src/widget/widgets.rs

@@ -1,6 +1,6 @@
 use crate::{
     IdLike, Widget, WidgetData, WidgetId,
-    util::{DynBorrower, HashSet, SlotVec},
+    util::{DynBorrower, HashSet, SlotVec, forget_mut, to_mut},
 };
 
 pub struct Widgets<State> {
@@ -36,12 +36,7 @@ impl<State: 'static> Widgets<State> {
     pub(crate) fn get_dyn_dynamic<'a>(&self, id: WidgetId) -> WidgetWrapper<'a, State> {
         // SAFETY: must guarantee no other mutable references to this widget exist
         // done through the borrow variable
-        #[allow(mutable_transmutes)]
-        let data = unsafe {
-            std::mem::transmute::<&WidgetData<State>, &mut WidgetData<State>>(
-                self.vec.get(id).unwrap(),
-            )
-        };
+        let data = unsafe { forget_mut(to_mut(self.vec.get(id).unwrap())) };
         if data.borrowed {
             panic!("tried to mutably borrow the same widget twice");
         }