Don't unlink node when updating inBitmap and verify undefined

src/renderer/atlas/DynamicCharAtlas.ts

@@ -335,7 +335,11 @@ export default class DynamicCharAtlas extends BaseCharAtlas {
       // Mark all new glyphs as in bitmap
       for (let i = 0; i < countAtGeneration; i++) {
         const key = this._glyphsWaitingOnBitmapQueue[i];
-        this._cacheMap.get(key).inBitmap = true;
+        const value = this._cacheMap.peekValue(key);
+        // If the value has already been evicted, do nothing
+        if (value) {
+          value.inBitmap = true;
+        }
         this._glyphsWaitingOnBitmapQueue[i] = 0;
       }
 

src/renderer/atlas/LRUMap.ts

@@ -80,6 +80,17 @@ export default class LRUMap<T> {
     return null;
   }
 
+  /**
+   * Gets a value from a key without marking it as the most recently used item.
+   */
+  public peekValue(key: number): T | null {
+    const node = this._map[key];
+    if (node !== undefined) {
+      return node.value;
+    }
+    return null;
+  }
+
   public peek(): T | null {
     const head = this._head;
     return head === null ? null : head.value;