New tab links open a new OS window about gdcef HOT 4 OPEN

@daniel-sanche I see what you are talking, but your link from my Firefox and for GDCEF is displayed on the same page split vertically. Do you mean a mouse click "open in a new tab" feature?

I obtain your result with https://duckduckgo.com and clicking on the blue button "add duck to your browser". When you are saying "this open a OS window". I guess simply it calls the secondary process gdcef/build/gdcefSubProcess which is a runnable browser application (edit: it used to be a browser since SHA1 e939b66 it seems no longer display).

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@daniel-sanche I've done implementing a basic 2D browser https://github.com/Lecrapouille/gdcef/tree/master/addons/gdcef/demos/2D when creating a new browser tab it opens my favorite radio webpage, you then can click on the "Tune In" icon this will create the OS windows. Now we can try to fix it and implement a C++ method on_popup_created and trigger a Godot callback returning the created browser as Godot node on_popup_created(node):

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Ok cool, that sounds like a good solution to me! Maybe by default it can just open the link in the current browser, if the user doesn't add the callback?

Also, when I was investigating this, it seemed to me like the CefLigfeSpanHandler functions in the GDCef Impl class weren't being called. I'm thinking maybe we need to implement GetDefaultClient() to register it as a client like in this sample?

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@daniel-sanche you are certainly right! For the moment I did not investigate

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