"On Close" events and handling the window close for WebView solutions #643
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Functionality to callback to the software that integrates webui,
on the event of clicking a 'close' button. When the user tries to close the window,
using WebView on Windows/Linux, webui will issue a callback (if installed) to the
integrating software asking if the window may be closed.
Not created for MacOS WebView currently, as I have no access to MacOS