Add constants for Diopser's editor

plugins/diopser/src/editor.rs

@@ -29,6 +29,9 @@ mod button;
 /// VIZIA uses points instead of pixels for text
 const POINT_SCALE: f32 = 0.75;
 
+const EDITOR_WIDTH: u32 = 600;
+const EDITOR_HEIGHT: u32 = 490;
+
 #[derive(Lens)]
 struct Data {
     params: Arc<DiopserParams>,
@@ -42,7 +45,7 @@ impl Model for Data {}
 
 // Makes sense to also define this here, makes it a bit easier to keep track of
 pub(crate) fn default_state() -> Arc<ViziaState> {
-    ViziaState::from_size(600, 490)
+    ViziaState::from_size(EDITOR_WIDTH, EDITOR_HEIGHT)
 }
 
 pub(crate) fn create(