brightness: delay setting for ddc monitors (#2022)

.config/quickshell/ii/services/Brightness.qml

@@ -103,16 +103,27 @@ Singleton {
             }
         }
 
-        function setBrightness(value: real): void {
-            value = Math.max(0.01, Math.min(1, value));
-            const rounded = Math.round(value * monitor.rawMaxBrightness);
-            if (Math.round(brightness * monitor.rawMaxBrightness) === rounded)
-                return;
-            brightness = value;
+        // We need a delay for DDC monitors because they can be quite slow and might act weird with rapid changes
+        property var setTimer: Timer {
+            id: setTimer
+            interval: monitor.isDdc ? 300 : 0
+            onTriggered: {
+                syncBrightness();
+            }
+        }
+
+        function syncBrightness() {
+            const rounded = Math.round(monitor.brightness * monitor.rawMaxBrightness);
             setProc.command = isDdc ? ["ddcutil", "-b", busNum, "setvcp", "10", rounded] : ["brightnessctl", "s", rounded, "--quiet"];
             setProc.startDetached();
         }
 
+        function setBrightness(value: real): void {
+            value = Math.max(0.01, Math.min(1, value));
+            monitor.brightness = value;
+            setTimer.restart();
+        }
+
         Component.onCompleted: {
             initialize();
         }