Attempting to create multiple WebViews crashes the program (on Mac OS only?)

[rdw-software]

This seems to be a limitation of the upstream library:

local webview = require("webview")

local view = webview.bindings.webview_create(true, nil)
print("First WebView created")

local view = webview.bindings.webview_create(true, nil)
print("Second WebView created")

local childview = webview.bindings.webview_create(true, webview.bindings.webview_get_window(view))
print("Child created")

Crashes with SEGFAULT on Mac OS. Fails with GTK warning in WSL?

(evo:262): Gtk-WARNING **: 15:27:22.020: Attempting to add a widget with type WebKitWebView to a GtkWindow, but as a GtkBin subclass a GtkWindow can only contain one widget at a time; it already contains a widget of type WebKitWebView

[rdw-software]

A few theories observations:

• The webview library uses hardcoded names for the webview config object, and recreates the app delegate for every instance
• Now, the Objective C runtime seems to crash when trying to create a second app delegate with the same name
• I was able to avoid this by checking for nullptr and exiting cleanly, which of course doesn't solve the real problem
• ... which is that there should be just one app delegate for each app, and it should handle all instances on its own
• It may be required to create a separate config object for each instance of cocoa_webkit_engine as well?

Not sure if that will help. Also need to test more on Windows/Linux, but that's left for later since OSX is the bigger problem.

[rdw-software]

I guess for the time being webviews can be limited to one instance per app, even if it's not ideal. But the SEGFAULT needs to go.

[rdw-software]

As shown by the SEGFAULT in #155, the problem is even more severe: There can't just be a single WebView that's currently active, but creating any view after the first seems to instantly crash the runtime. That makes it quite annoying to test, and it also means that no long-running program can create more than a single, global/shared view without crashing.

Unfortunately, fixing this would mean replacing a lot of the OSX specific code in the webview library. Is there an easy way out?

[rdw-software]

Waiting for #201 to be completed.