add original position

src/UI/UIWindow.js

@@ -1369,6 +1369,9 @@ async function UIWindow(options) {
                 }
 
                 $(el_window).addClass('window-dragging');
+                
+                // rm window from original_window_position
+                window.original_window_position[$(el_window).attr('id')] = undefined;
 
                 // since jquery draggable sets the z-index automatically we need this to 
                 // bring windows to the front when they are clicked.

src/globals.js

@@ -142,6 +142,9 @@ if (window.location !== window.parent.location) {
 window.desktop_height = window.innerHeight - window.toolbar_height - window.taskbar_height;
 window.desktop_width = window.innerWidth;
 
+// {id: {left: 0, top: 0}}
+window.original_window_position = {};
+
 // recalculate desktop height and width on window resize
 $( window ).on( "resize", function() {
     const new_desktop_height = window.innerHeight - window.toolbar_height - window.taskbar_height;
@@ -149,19 +152,33 @@ $( window ).on( "resize", function() {
 
     $('.window').each((_, el) => {
         const pos = $(el).position();
+        const id = $(el).attr('id');
+
+        if(!window.original_window_position[id]){
+            window.original_window_position[id] = {
+                left: pos.left,
+                top: pos.top
+            }
+        }
+
         const leftRadio = pos.left / window.desktop_width;
         const topRadio = pos.top / window.desktop_height;
 
         let left = new_desktop_width * leftRadio;
         let top = new_desktop_height * topRadio;
+
         const maxLeft = new_desktop_width - $(el).width();
         const maxTop = new_desktop_height - $(el).height();
 
+        // first move the window to the original position
+        const originalLeft = window.original_window_position[id].left;
+        const originalTop = window.original_window_position[id].top;
+
         if(left < 0) left = 0;
-        else if(left > maxLeft) left = maxLeft;
+        else if(left > maxLeft || originalLeft > maxLeft) left = maxLeft;
 
         if(top < window.toolbar_height) top = window.toolbar_height;
-        else if(top > maxTop) top = maxTop + window.toolbar_height;
+        else if(top > maxTop || originalTop > maxTop) top = maxTop + window.toolbar_height;
 
         $(el).css({
             left,