Fix not responding next/previous when focus in webview

For some reason in the latest Qt versions the webview took over the
focus from the keyboard, once clicked on the webview the arrow
keys wouldn't register up and thus you couldn't navigate with them
anymore.

This patch fixes this problem by using window.location.href and
checkinf for those special urls. This is way easier to use than
WebChannels.

html/content.js

@@ -71,3 +71,15 @@ function setNightmode(nightmode) {
     if(nightmode) document.body.className = "nightmode";
     else document.body.className = "";
 }
+
+document.onkeydown = checkKey;
+
+function checkKey(e) {
+    e = e || window.event;
+    if (e.keyCode == '37') {
+        window.location.href = "feedthemonkey:previous";
+    }
+    else if (e.keyCode == '39') {
+        window.location.href = "feedthemonkey:next";
+    }
+}

qml/Content.qml

@@ -85,9 +85,14 @@ Item {
             webView.runJavaScript("if(typeof setNightmode == \"function\") setNightmode(" + (content.nightmode ? "true" : "false") + ")")
         }
 
-
         onNavigationRequested: {
-            if (request.navigationType != WebEngineView.LinkClickedNavigation) {
+            if (request.url == "feedthemonkey:previous") {
+                request.action = WebEngineView.IgnoreRequest;
+                app.showPreviousPost();
+            } else if (request.url == "feedthemonkey:next") {
+                request.action = WebEngineView.IgnoreRequest;
+                app.showNextPost();
+            } else if (request.navigationType != WebEngineView.LinkClickedNavigation) {
                 request.action = WebEngineView.AcceptRequest;
             } else {
                 request.action = WebEngineView.IgnoreRequest;

qml/main.qml

@@ -114,6 +114,14 @@ ApplicationWindow {
         return forEscapingHTML.getText(0, forEscapingHTML.length)
     }
 
+    function showNextPost() {
+        sidebar.next()
+    }
+
+    function showPreviousPost() {
+        sidebar.previous()
+    }
+
     function keyPressed(event) {
         switch (event.key) {
         case Qt.Key_Right: