Application hangs in blocking event handlers

[r0x0r]

If you call evaluate_js or any other window function that must be run on the main thread from a blocking event (eg. closing). This is caused by the fact that evaluate_js and others are not designed to be run on the main thread. A lock inside the function blocks the main thread and as the result function never returns. Event handlers in blocking mode are run on the main thread as well resulting in a deadlock. The bug has been discovered in this pr

I have briefly attempted to fix this, but could not find a solution, nor I am sure it is possible at all with the current blocking event architecture. At very least application should not result in hanging.

Input is welcomed

[github-actions]

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