remove state generic from a lot of things

src/widget/position/scroll.rs

@@ -1,7 +1,7 @@
 use crate::prelude::*;
 
-pub struct Scroll<State> {
-    inner: WidgetHandle<State>,
+pub struct Scroll {
+    inner: WidgetHandle,
     axis: Axis,
     amt: f32,
     snap_end: bool,
@@ -9,8 +9,8 @@ pub struct Scroll<State> {
     content_len: f32,
 }
 
-impl<State: 'static> Widget<State> for Scroll<State> {
-    fn draw(&mut self, painter: &mut Painter<State>) {
+impl Widget for Scroll {
+    fn draw(&mut self, painter: &mut Painter) {
         let output_len = painter.output_size().axis(self.axis);
         let container_len = painter.region().axis(self.axis).len();
         let content_len = painter
@@ -31,17 +31,17 @@ impl<State: 'static> Widget<State> for Scroll<State> {
         painter.widget_within(&self.inner, region);
     }
 
-    fn desired_width(&mut self, ctx: &mut SizeCtx<State>) -> Len {
+    fn desired_width(&mut self, ctx: &mut SizeCtx) -> Len {
         ctx.width(&self.inner)
     }
 
-    fn desired_height(&mut self, ctx: &mut SizeCtx<State>) -> Len {
+    fn desired_height(&mut self, ctx: &mut SizeCtx) -> Len {
         ctx.height(&self.inner)
     }
 }
 
-impl<State> Scroll<State> {
-    pub fn new(inner: WidgetHandle<State>, axis: Axis) -> Self {
+impl Scroll {
+    pub fn new(inner: WidgetHandle, axis: Axis) -> Self {
         Self {
             inner,
             axis,