Rerwite everything to share an egui context

src/window/vip/framebuffer.rs

@@ -1,6 +1,6 @@
 use egui::{
     Align, CentralPanel, Color32, Image, ScrollArea, Slider, TextEdit, TextureOptions, Ui,
-    ViewportBuilder, ViewportId,
+    ViewportBuilder,
 };
 use egui_extras::{Column, Size, StripBuilder, TableBuilder};
 
@@ -134,10 +134,6 @@ impl FrameBufferWindow {
 }
 
 impl AppWindow for FrameBufferWindow {
-    fn viewport_id(&self) -> ViewportId {
-        ViewportId::from_hash_of(format!("framebuffer-{}", self.sim_id))
-    }
-
     fn sim_id(&self) -> SimId {
         self.sim_id
     }