[docs] Fix demo code selection through copy shortcut key on Firefox browser #35670
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Fixes #35645
The
window.getSelection()
returns an empty string on Firefox browser for a text inside a form field i.e textarea due to which the check fails and copies the whole code text.See bug opened 22 years ago which isn't yet fixed: https://bugzilla.mozilla.org/show_bug.cgi?id=85686.
I copied the same logic as in mui/mui-x#6593 which works well.
Link to test after fix: https://deploy-preview-35670--material-ui.netlify.app/material-ui/react-menu/#main-content
The specs needs to clarify this: w3c/selection-api#83, w3c/selection-api#7