Properly disable presentation mode when the viewer is embedded #3641
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Currently presentation mode isn't properly disabled when the viewer is embedded in a web page.
Steps to reproduce:
Ctrl+Alt+P
.(Note that the toolbar button isn't visible, but that's only because the PDF.js UI is too small.)EDIT: Now that the secondary toolbar has landed, the presentation mode button will be available from it, thus making it a lot easier for the user to enter a non-working presentation mode.Expected result: Presentation mode should either work, or be disabled.
Actual result: (A picture is worth a thousand words...)

This PR adds a check in
PDFView.supportsFullscreen
to disable presentation mode when the viewer is embedded, to avoid the above issue.