[Editor] Only focus the canvas for mouse events when drawing in the canvas

And if we've to focus it, we must prevent scrolling to avoid to draw at an
unexpected position.

src/display/editor/ink.js

@@ -660,8 +660,13 @@ class InkEditor extends AnnotationEditor {
 
     event.preventDefault();
 
-    if (event.type !== "mouse") {
-      this.div.focus();
+    if (
+      event.pointerType !== "mouse" &&
+      !this.div.contains(document.activeElement)
+    ) {
+      this.div.focus({
+        preventScroll: true /* See issue #17327 */,
+      });
     }
 
     this.#startDrawing(event.offsetX, event.offsetY);