* Fix browser pane stuck in HTML fullscreen (#6442)
Guest content in a browser pane could enter HTML fullscreen but not
exit it: requestFullscreen() resized the host BrowserWindow into native
fullscreen, and exitFullscreen() had nothing to restore, leaving the
pane stuck.
Set the webview's disableHtmlFullscreenWindowResize preference so HTML
fullscreen is contained to the <webview> element. Exit then works and
fullscreenchange fires as guests expect.
* Apply browser guest fullscreen policy consistently
Co-authored-by: Orca <help@stably.ai>
---------
Co-authored-by: Wolfgang Schoenberger <221313372+wolfiesch@users.noreply.github.com>
Co-authored-by: Jinwoo-H <jinwoo0825@gmail.com>
Co-authored-by: Orca <help@stably.ai>
