Shutdown crashes since CEF 77

[salvadordf]

Some demos crash due to an access violation when they shutdown.

It looks like the CEF binaries are trying to reinitialize the network context after the PrefService has been cleared :
https://bitbucket.org/chromiumembedded/cef/issues/2703/crash-when-closing-if

This issue is much easier to detect if you use :

• Demos that load an HTML file using a URL with a FILE scheme, especially if the file doesn't exist.
• Demos that create URLRequests.
• Demos that use the TChromiumWindow component.

Using the TCEFSentinel component seems to be a valid workaround for the rest of the demos. It adds an extra step to the destruction sequence and checks the number of child processes before triggering the TCEFSentinel.OnClose event. Read the code comments in the demos for more details.

Other CEF shutdown issues :
https://bitbucket.org/chromiumembedded/cef/issues/2316/crash-during-shutdown-due-to
https://bitbucket.org/chromiumembedded/cef/issues/2798/dcheck-exception-on-cefclient-shutdown

[salvadordf]

Use the latest CEF4Delphi stable release to avoid this issue :
https://github.com/salvadordf/CEF4Delphi/releases/tag/75.0.3770.100

[salvadordf]

Some demos in the last stable release don't disable the "Network Service". If you see shutdown issues with that release, add this before the GlobalCEFApp.StartMainProcess (or GlobalCEFApp.StartSubProcess) call in the DPR file :
GlobalCEFApp.DisableFeatures := 'NetworkService';

The MiniBrowser demo in that release already has that code line here :

CEF4Delphi/demos/Delphi_VCL/MiniBrowser/MiniBrowser.dpr

Line 68 in bb2adb0

GlobalCEFApp.DisableFeatures := 'NetworkService';

[salvadordf]

The update to CEF 78.3.9 fixed this issue