Memory leak related to editor

[SimonSiefke]

Does this issue occur when all extensions are disabled?: Yes

• VS Code Version: 1.90.2
• OS Version: Ubuntu 24.04

Steps to Reproduce

1. Create a file "a.txt" with contents "a"
2. Create a file "b.txt" with contents "b"
3. Open file "a.txt", then open file "b.txt"
4. Repeat switching tabs several times
5. Notice that the number of detached Canvas elements increases by 3 each time

Test script

git clone [email protected]:SimonSiefke/vscode-memory-leak-finder.git &&
cd vscode-memory-leak-finder &&
git checkout v5.49.0 &&
npm ci &&
node packages/cli/bin/test.js --cwd packages/e2e --only  editor.switch-between-tabs --check-leaks --measure-after --measure canvas-count --runs 17 &&
cat .vscode-memory-leak-finder-results/canvas-count/editor.switch-between-tabs.json 

Test results

The number of canvas elements increases each time, indicating a memory leak:

Additional information

• The memory leak seems not related to event listeners. The number of event listeners doesn't seem to increase during the tests.

• Something seems to be holding on to disposed monaco editors, each monaco editor containing 3 canvas elements.

[TylerLeonhardt]

@bpasero assigned you from an editor/tabs perspective? Maybe you have an idea

[bpasero]

Sounds to me like it could be Minimap.

[SimonSiefke]

I tested again with VSCode 1.92.1 and found no more memory leaks related to canvas.

v1.90.2

v1.91.2: