Index: sources/gui/qml/compounds/ValueAdjuster.qml
===================================================================
diff -u -rea4de12b2c7d6306a9cb89ff23eb95ccd25077a1 -r40ddf63592b60608ae34aeb3099fe4e62ae45054
--- sources/gui/qml/compounds/ValueAdjuster.qml	(.../ValueAdjuster.qml)	(revision ea4de12b2c7d6306a9cb89ff23eb95ccd25077a1)
+++ sources/gui/qml/compounds/ValueAdjuster.qml	(.../ValueAdjuster.qml)	(revision 40ddf63592b60608ae34aeb3099fe4e62ae45054)
@@ -24,41 +24,46 @@
     property real   minimum     : 0
     property real   maximum     : 0
     property real   value       : 0
-    property real  defaultValue : 0
+    property real   defaultValue: 0
     property real   step        : 0
-
+    property real   actualValue : 0
     property bool   active      : false
     property bool   editable    : true
+    property bool   allowOff    : false
+    property bool   synchronize : false
 
-    property bool canIncrement  : active ? value < maximum : true
-    property bool canDecrement  : active ? allowOff ? value > 0 :
-                                                      value > minimum : true
-
-    property bool allowOff      : false
-
     // fix floating-point precision issue
     readonly property real stepVal  : Math.round(step       * 100) / 100
     readonly property real minVal   : Math.round(minimum    * 100) / 100
     readonly property real val      : Math.round(value      * 100) / 100
 
-    onActiveChanged             : if ( active ) { _root.value = _root.defaultValue }
+    readonly property bool canIncrement  : active ? value < maximum : true
+    readonly property bool canDecrement  : active ? allowOff ? value > 0 :
+                                                      value > minimum : true
 
-    function clear() { _root.active = false }
+    onActiveChanged             : {
+        // use actual value not default value to synchronize
+        if ( synchronize )  { synchronize = false; return;      }
 
+        if ( active )       { _root.value = _root.defaultValue  }
+    }
+
+    function sync () { value = actualValue; synchronize = true  }
+
+    function clear() { _root.active = false                     }
+
     function increment() {
-        if ( ! active )     { active = true                                 }
-        else {
-            if ( allowOff ) { value = val < minVal ? minVal : val + stepVal }
-            else            { value += stepVal                              }
-        }
+        if ( ! active )     { active = true; return;                    }
+
+        if ( allowOff ) { value = val < minVal ? minVal : val + stepVal }
+        else            { value += stepVal                              }
     }
 
     function decrement() {
-        if ( ! active )     { active = true                             }
-        else {
-            if ( allowOff ) { value = val > minVal ? val - stepVal : 0  }
-            else            { value -= stepVal                          }
-        }
+        if ( ! active )     { active = true; return;                    }
+
+        if ( allowOff ) { value = val > minVal ? val - stepVal : 0      }
+        else            { value -= stepVal                              }
     }
 
     Text { id: _text
@@ -118,10 +123,7 @@
             pressAndHoldInterval: 0
 
             onClicked: {
-                if ( _root.editable ) {
-                    active  = true
-                    focus   = true
-                }
+                if ( _root.editable ) { active = true; focus = true }
 
                 _slider.opacity = 0
             }
@@ -133,10 +135,7 @@
             }
 
             onPressAndHold: {
-                if ( _root.editable ) {
-                    active  = true
-                    focus   = true
-                }
+                if ( _root.editable ) { active = true; focus = true }
 
                 _sliderMouseArea.grabbed = true
             }