The change event shouldn't be raised on an upload input if the value wasn't changed after setFilesToUpload

[dmitry-kurmanov]

I guess we have a different behaviour between testcafe's setFilesToUpload and browser users.

If we try to use setFilesToUpload to upload same file as before, then input[type=file] will updates. But if we try to do it "by hand" it will not updates. It is native behavior.

You can check it in my repo: https://github.com/dmitrykurmanov/surveyjs_testcafe
cli command: testcafe chrome tests/questions/file.js -T "setFilesToUpload_issue"

This test must be fail, but it is not.

Steps to reproduce native behaviour "by hand":

1. choose big file ../resources/big_Dashka.jpg
2. click "change_file_max_size" button
3. choose same file
4. see that error message is here and there is no preview, but by testcafe's setFilesToUpload this is not true

[AndreyBelym]

We do not check if the value of file input is actually changed. Chrome do not raise change event if the currently selected file was chosen again. We raise change event every time, even if the new file is the already selected file.

[lock]

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