Possible memory leak when opening more than 15 editors

[kittaakos]

Steps to reproduce:

• Clone, build and run 41d3656.
• Open 15 editors.

Although this is just a possible memory leak, we should investigate it.

Error: Possible Emitter memory leak detected. 30 exit listeners added. Use event.maxListeners to increase limit
    at e.checkMaxListeners (event.ts:189)
    at Proxy._event._event.Object.assign.maxListeners (event.ts:155)
    at e.<anonymous> (monaco-text-model-service.ts:66)
    at problem-marker.ts:26
    at Object.next (problem-marker.ts:26)
    at a (problem-marker.ts:26)
Error: Possible Emitter memory leak detected. 30 exit listeners added. Use event.maxListeners to increase limit
    at e.checkMaxListeners (event.ts:189)
    at Proxy._event._event.Object.assign.maxListeners (event.ts:155)
    at e.<anonymous> (monaco-text-model-service.ts:66)
    at problem-marker.ts:26
    at Object.next (problem-marker.ts:26)
    at a (problem-marker.ts:26)

Update:
Bumping up to the next Theia might solve the issue out of the box.

[kittaakos]

Bumping up to the next Theia might solve the issue out of the box.

No. It does not.

[JanKoehnlein]

Scheduled for re-evaluation after upgrading to latest Theia and Sprotty.