[3899] Fix nodesDraggable staying false

[mcharfadi]

Bug: #3899

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[sbegaudeau]

It may improve the situation but it is not enough to fix all issues, I can easily reproduce the bug by maintaining alt and clicking on another tab. This does not seem to trigger the blur event of the document.

[sbegaudeau]

In my use case, the listener needs to be all the way up on the window and not just the document. This way it also works if the user minimizes the window now.

[sbegaudeau]

I'll merge it after the build