Scope willRender to PageRenderer only

The `willRender` property introduced to the generic `Renderer<E, S>`
only applies to the `PageRenderer` specialized sub-class. This commit
removes it from the root class and declares a
`PageRenderer.constructor()` method to accept and assign it.

src/core/drive/page_renderer.js

@@ -10,6 +10,11 @@ export class PageRenderer extends Renderer {
     }
   }
 
+  constructor(currentSnapshot, newSnapshot, renderElement, isPreview, willRender = true) {
+    super(currentSnapshot, newSnapshot, renderElement, isPreview)
+    this.willRender = willRender
+  }
+
   get shouldRender() {
     return this.newSnapshot.isVisitable && this.trackedElementsAreIdentical
   }

src/core/frames/frame_controller.js

@@ -307,7 +307,7 @@ export class FrameController {
 
     if (newFrameElement) {
       const snapshot = new Snapshot(newFrameElement)
-      const renderer = new FrameRenderer(this, this.view.snapshot, snapshot, FrameRenderer.renderElement, false, false)
+      const renderer = new FrameRenderer(this, this.view.snapshot, snapshot, FrameRenderer.renderElement, false)
       if (this.view.renderPromise) await this.view.renderPromise
       this.changeHistory()
 

src/core/frames/frame_renderer.js

@@ -15,8 +15,8 @@ export class FrameRenderer extends Renderer {
     }
   }
 
-  constructor(delegate, currentSnapshot, newSnapshot, renderElement, isPreview, willRender = true) {
-    super(currentSnapshot, newSnapshot, renderElement, isPreview, willRender)
+  constructor(delegate, currentSnapshot, newSnapshot, renderElement, isPreview) {
+    super(currentSnapshot, newSnapshot, renderElement, isPreview)
     this.delegate = delegate
   }
 

src/core/renderer.js

@@ -3,11 +3,10 @@ import { Bardo } from "./bardo"
 export class Renderer {
   #activeElement = null
 
-  constructor(currentSnapshot, newSnapshot, renderElement, isPreview, willRender = true) {
+  constructor(currentSnapshot, newSnapshot, renderElement, isPreview) {
     this.currentSnapshot = currentSnapshot
     this.newSnapshot = newSnapshot
     this.isPreview = isPreview
-    this.willRender = willRender
     this.renderElement = renderElement
     this.promise = new Promise((resolve, reject) => (this.resolvingFunctions = { resolve, reject }))
   }