Uncaught (in promise) Error: Operation cancelled

[paulsmirnov]

Describe the bug
The error Uncaught (in promise) Error: Operation cancelled is generated when you load a file while the previous load is in progress. This must be a kind warning rather than an uncaught exception.

To Reproduce
Steps to reproduce the behavior:

1. Edit 'miew_via_global.html' example to add another loading call after init.
2. Open the HTML file in a browser and check the console.
3. See the error

      var viewer = new Miew({
        container: document.getElementsByClassName('miew-container')[0],
        load: '1CRN',
      });

      if (viewer.init()) {
        viewer.load('4XN6');  // <-- the added line
        viewer.run();
      }

Expected behavior
No uncaught exceptions happen. A warning is produced instead.

Screenshots

Desktop:

• OS: Windows 11
• Browser: Chrome 140.0.7339.208 (Official Build) (64-bit)
• Version: Miew v0.11.0 and the latest main branch