Clicking "Add" filter and then canceling dialog results in "You have unsaved changes."

I tested the 8.x patch in #1. It works great! I tested it manually using a variety of add and edit dialogs, and it correctly displayed or didn't display the "changed" message at the right times.

And you're right, the same bug exists in Views 7.x -- I just never noticed it before, amazingly, because I use Views all the time. In 7.x, incidentally, besides putting up the "changed" message, Views UI thinking the view has changed also makes the Save button visible. This behavior is not replicated in 8.x.

The code in this patch has a minor formatting problem:

+  public function __construct($changed) {
+    $this->changed = $changed;
+  }
   /**

Needs an extra blank line inserted here between the new __construct() function and the next function.

And here:

+      'changed' =>  $this->changed,

There is extra space in this line after ==>

Looks good to me! The code formatting is correct now, and I tested the patch with the same code in it previously (only changes were whitespace).

I hesitate to mark it RTBC because I am not Views maintainer... will ping someone in IRC to give it a final review.