Replaced ifvisible.js with simple drop-in to handle prefetch messages

README.md

@@ -74,26 +74,27 @@ Things might work in Edge 15-18, Firefox 47-62 and Chrome 54-68 due to one polyf
 * Removed momentjs (localization still used)
 * Removed opentip (use CSS)
 * Replaced Autolinker with simple https/email detection
+* Replaced ifvisible.js with simple drop-in replacement
 
 |js/*       	|1.14.0 	|native 	|gzip 1.14	|gzip   	|
 |-----------	|--------:	|--------:	|--------:	|--------:	|
-|admin.js    	|2.130.942	|1.119.218	|  485.481	|  271.178	|
+|admin.js    	|2.130.942	|1.119.128	|  485.481	|  271.258	|
-|app.js      	|4.184.455	|2.829.958	|  932.725	|  659.546	|
+|app.js      	|4.184.455	|2.829.541	|  932.725	|  659.696	|
 |boot.js     	|  671.522	|   44.029	|  169.502	|   15.460	|
-|libs.js     	|  647.614	|  318.711	|  194.728	|   99.162	|
+|libs.js     	|  647.614	|  316.107	|  194.728	|   98.214	|
 |polyfills.js	|  325.834	|        0	|   71.825	|        0	|
-|TOTAL js   	|7.960.367	|4.311.916	|1.854.261	|1.045.346	|
+|TOTAL js   	|7.960.367	|4.308.805	|1.854.261	|1.044.628	|
 
 |js/min/*       	|1.14.0   	|native   	|gzip 1.14	|gzip   	|
 |---------------	|--------:	|--------:	|--------:	|--------:	|
-|admin.min.js    	|  252.147	|  151.652	| 73.657	| 43.325	|
+|admin.min.js    	|  252.147	|  151.632	| 73.657	| 43.313	|
-|app.min.js      	|  511.202	|  377.227	|140.462	| 99.095	|
+|app.min.js      	|  511.202	|  377.163	|140.462	| 99.062	|
 |boot.min.js     	|   66.007	|    5.589	| 22.567	|  2.333	|
-|libs.min.js     	|  572.545	|  303.360	|176.720	| 93.728	|
+|libs.min.js     	|  572.545	|  300.211	|176.720	| 92.698	|
 |polyfills.min.js	|   32.452	|        0	| 11.312	|      0	|
-|TOTAL js/min   	|1.434.353	|  837.828	|424.718	|238.481	|
+|TOTAL js/min   	|1.434.353	|  834.595	|424.718	|237.406	|
 
-596.525 bytes (186.237 gzip) is not much, but it feels faster.
+599.758 bytes (187.312 gzip) is not much, but it feels faster.
 
 
 |css/*       	|1.14.0   	|native   	|

dev/Common/Enums.js

@@ -460,7 +460,6 @@ export const ContactPropertyType = {
  */
 export const Magics = {
 	'EventWhichMouseMiddle': 3,
-	'ifvisibleIdle10s': 10,
 
 	'BitLength2048': 2048,
 	'BitLength1024': 1024,

dev/External/ifvisible.js

@@ -0,0 +1,46 @@
+(() => {
+    const doc = document,
+      visible = "visible",
+      wakeUp = () => {
+        clearTimeout(timer);
+        if (status !== visible) {
+          status = visible;
+        }
+        timer = setTimeout(() => {
+          if (status === visible) {
+            status = "idle";
+            dispatchEvent(new CustomEvent("idle"));
+          }
+        }, 10000);
+      };
+    var initialized = false,
+        status = visible,
+        timer = false;
+
+    function init() {
+      if (initialized) {
+        return true;
+      }
+      doc.addEventListener("visibilitychange", () => {
+        status = doc.visibilityState;
+        doc.hidden || wakeUp();
+      }, false);
+      initialized = true;
+      wakeUp();
+      doc.addEventListener("mousemove", wakeUp);
+      doc.addEventListener("keyup", wakeUp);
+      doc.addEventListener("touchstart", wakeUp);
+      addEventListener("scroll", wakeUp);
+    }
+
+    window.ifvisible = {
+      idle: callback => {
+        init();
+        addEventListener("idle", callback);
+      },
+      now: () => {
+        init();
+        return status === visible;
+      }
+    };
+})();

package.json

@@ -84,7 +84,6 @@
     "gulp-through": "0.4.0",
     "gulp-util": "3.0.8",
     "gulp-zip": "5.0.1",
-    "ifvisible.js": "1.0.6",
     "jquery": "^3.5.1",
     "knockout": "3.4.2",
     "knockout-sortable": "1.2.0",

tasks/config.js

@@ -89,7 +89,7 @@ config.paths.js = {
 			'vendors/lightgallery/dist/js/lg-thumbnail.min.js',
 			'vendors/lightgallery/dist/js/lg-zoom.min.js',
 			'vendors/lightgallery/dist/js/lg-autoplay.min.js',
-			'node_modules/ifvisible.js/src/ifvisible.min.js'
+			'dev/External/ifvisible.js'
 		]
 	},
 	app: {

yarn.lock

@@ -3697,10 +3697,6 @@ iferr@^0.1.5:
   version "0.1.5"
   resolved "https://registry.yarnpkg.com/iferr/-/iferr-0.1.5.tgz#c60eed69e6d8fdb6b3104a1fcbca1c192dc5b501"
 
-ifvisible.js@1.0.6:
-  version "1.0.6"
-  resolved "https://registry.yarnpkg.com/ifvisible.js/-/ifvisible.js-1.0.6.tgz#52eb151ce89c56f15316226462e892d1f8451261"
-
 ignore-walk@^3.0.1:
   version "3.0.1"
   resolved "https://registry.yarnpkg.com/ignore-walk/-/ignore-walk-3.0.1.tgz#a83e62e7d272ac0e3b551aaa82831a19b69f82f8"