CKEditor 5 integration is leaking memory

[oleq]

Description

Hi, I'm a core developer of CKEditor 5 👋

I'd like to inform you that the MathType plugin for the CKEditor 5 retains (lots of) memory when the editor is destroyed. This has been brought to our team's attention by our community and causes issues with integrations that re-start the editor a lot and/or use lots of editor instances on the same page.

Environment

• Version: "@wiris/mathtype-ckeditor5": "^7.24.0",
• CKEditor 5
• Tested in Chrome on Mac

Steps to reproduce

1. Close all Chrome windows.
2. Run Chrome with a guest profile (free of add-ons, etc.), on Mac this would be /Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome --guest --js-flags="--expose-gc"
3. Configure CKEditor 5 without MathType.
4. Initialize the editor, then destroy it a couple of times. Click the Garbage Collector button after each destruction. Make sure no references are left behind (such as window.editor).
5. Take a memory snapshot.
6. Repeat 4.-5. a couple of times.
7. Configure CKEditor 5 with MathType enabled.
8. Repeat 4.-5. a couple of times.

Expected result

There should be no dramatic difference in snapshot size and retained memory.

Actual result

The presence of the MathType causes the editor to leak memory which is retained after each destruction.

Other details

Related issues in CKEditor 5:

• Investigate the size of memory leaks ckeditor/ckeditor5#10749
• Memory leak after creating and destroying the editor ckeditor/ckeditor5#5954

[carla-at-wiris]

Hello @oleq,

Thank you so much for the information and for reporting the issue. We've added it on our backlog and will start working on it as soon as we can.

[icaparros-at-wiris]

Hi @oleq,

We are happy to inform you that this issue has been fixed in the 7.28.0 version.

We are proceding to close the issue.