[Editor] Commit the current drawing before switching the current mode

It fixes mozilla#19793.

Author: calixteman

src/display/editor/tools.js

@@ -1680,6 +1680,7 @@ class AnnotationEditorUIManager {
     }
 
     this.#updateModeCapability = Promise.withResolvers();
+    this.#currentDrawingSession?.commitOrRemove();
 
     this.#mode = mode;
     if (mode === AnnotationEditorType.NONE) {

src/display/touch_manager.js

@@ -215,9 +215,12 @@ class TouchManager {
     if (evt.touches.length >= 2) {
       return;
     }
-    this.#touchMoveAC.abort();
-    this.#touchMoveAC = null;
-    this.#onPinchEnd?.();
+    // #touchMoveAC shouldn't be null be it seems that irl it can (see #19793).
+    if (this.#touchMoveAC) {
+      this.#touchMoveAC.abort();
+      this.#touchMoveAC = null;
+      this.#onPinchEnd?.();
+    }
 
     if (!this.#touchInfo) {
       return;