Webview specific handlers are not cleaned up when webview is disposed

[jonah-iden]

When registering a message handler for a specific webview (sender = webviewId) then the handler is not disposed automaticly when the webview is disposed. The current webview onDidDispose code looks like this:

view.onDidDispose(() => {
    this.viewRegistry.delete(viewEntry.id);
    const removed = this.viewTypeRegistry.get(viewType)?.delete(view);
    if (!removed) {
        this.log(`Attempt to remove non-existing registry entry for View: ${viewEntry.id} (type ${viewType})`, 'warn');
    }
});

It would be nice if those webview specific handlers would be disposed here automaticly

[dhuebner]

Solved with #58
Thanks @jonah-iden !