brightness: fix osd suppression

Services/DisplayService.qml

@@ -25,6 +25,7 @@ Singleton {
     }
     property int maxBrightness: 100
     property bool brightnessInitialized: false
+    property bool suppressNextOsd: false
 
     signal brightnessChanged
     signal deviceSwitched
@@ -56,7 +57,12 @@ Singleton {
         newBrightness[device.id] = device.currentPercent
         deviceBrightness = newBrightness
 
-        if (!suppressSignal && oldValue !== device.currentPercent) {
+        const shouldSuppress = suppressSignal || suppressNextOsd
+        if (suppressNextOsd) {
+            suppressNextOsd = false
+        }
+
+        if (!shouldSuppress && oldValue !== device.currentPercent) {
             brightnessChanged()
         }
     }
@@ -119,6 +125,10 @@ Singleton {
             return
         }
 
+        if (suppressOsd) {
+            suppressNextOsd = true
+        }
+
         DMSService.sendRequest("brightness.setBrightness", {
                                    "device": actualDevice,
                                    "percent": clampedValue
@@ -531,7 +541,7 @@ Singleton {
         }
 
         function onBrightnessDeviceUpdate(device) {
-            updateSingleDevice(device, true)
+            updateSingleDevice(device, false)
         }
     }