Auto-delete snap group with 1 window if not populated in 6 seconds

Author: emvaized

contents/ui/code/windows.js

@@ -323,7 +323,18 @@ function removeWindowFromTrack(windowId, callback){
     if (i > -1) {
         snappedWindowGroups[i].windows.splice(i2, 1);
         if (callback) callback(snappedWindowGroups[i]);
-        if (snappedWindowGroups[i].windows.length < 1) snappedWindowGroups.splice(i, 1);
+        const remainingWindowsCount = snappedWindowGroups[i].windows.length;
+        if (remainingWindowsCount < 1) snappedWindowGroups.splice(i, 1); /// delete empty group
+        else if (remainingWindowsCount === 1) {
+            /// set timer to delete group if not populated in few seconds
+
+            const remainingWindowId = snappedWindowGroups[i].windows[0];
+            setOneTimeTimeout(function(){
+                /// group index may have changed
+                const i3 = snappedWindowGroups.findIndex((group) => group.windows.indexOf(remainingWindowId) > -1 && group.windows.length < 2);
+                if (i3 > -1) snappedWindowGroups.splice(i3, 1);
+            }, 6000);
+        }
     }
 }
 
@@ -453,3 +464,19 @@ function sortClientsByLastActive() {
         return activationTime[windowIdA] - activationTime[windowIdB];
     });
 }
+
+/// One-time timer, when we want multiple timers run in parallel
+function setOneTimeTimeout(cb, delayTime){
+    function Timer() {
+        return Qt.createQmlObject("import QtQuick 2.0; Timer {}", main);
+    }
+
+    const timer = new Timer();
+    timer.interval = delayTime;
+    timer.repeat = false;
+    timer.triggered.connect(function(){
+        cb();
+        timer.destroy();
+    });
+    timer.start();
+}

contents/ui/main.qml

@@ -365,9 +365,8 @@ Window {
         }
     }
 
-    /// Timer to delay snap assist reveal.
-    /// Delay is added to get the updated snapped window's size and location,
-    /// which sometimes differs from the half of the screen
+    /// Reusable timer,
+    /// used for regular actions on each assist reveal and hide
     Timer {
         id: timer
         function setTimeout(cb, delayTime) {