Remove containing box for web view. Fixes #2848

Mac/MainWindow/Detail/DetailWebViewController.swift

@@ -63,16 +63,6 @@ final class DetailWebViewController: NSViewController, WKUIDelegate {
 	}
 
 	override func loadView() {
-		// Wrap the webview in a box configured with the same background color that the web view uses
-		let box = NSBox(frame: .zero)
-		box.boxType = .custom
-		box.isTransparent = true
-		box.titlePosition = .noTitle
-		box.contentViewMargins = .zero
-		box.fillColor = NSColor(named: "webviewBackgroundColor")!
-
-		view = box
-		
 		let preferences = WKPreferences()
 		preferences.minimumFontSize = 12.0
 		preferences.javaScriptCanOpenWindowsAutomatically = false
@@ -96,7 +86,7 @@ final class DetailWebViewController: NSViewController, WKUIDelegate {
 			webView.customUserAgent = userAgent
 		}
 
-		box.addSubview(webView)
+		view = webView
 
 		// Use the safe area layout guides if they are available.
 		if #available(OSX 11.0, *) {

Mac/Resources/Assets.xcassets/webviewBackgroundColor.colorset/Contents.json

@@ -1,38 +0,0 @@
-{
-  "info" : {
-    "version" : 1,
-    "author" : "xcode"
-  },
-  "colors" : [
-    {
-      "idiom" : "universal",
-      "color" : {
-        "color-space" : "srgb",
-        "components" : {
-          "red" : "1.000",
-          "alpha" : "1.000",
-          "blue" : "1.000",
-          "green" : "1.000"
-        }
-      }
-    },
-    {
-      "idiom" : "universal",
-      "appearances" : [
-        {
-          "appearance" : "luminosity",
-          "value" : "dark"
-        }
-      ],
-      "color" : {
-        "color-space" : "display-p3",
-        "components" : {
-          "red" : "0.176",
-          "alpha" : "1.000",
-          "blue" : "0.176",
-          "green" : "0.176"
-        }
-      }
-    }
-  ]
-}