Index: sources/gui/qml/compounds/ValueAdjuster.qml
===================================================================
diff -u -rda2dbdbd92d099e44d11bbfb2b794d5ee19a0f0a -r02f5bd9c52c936b9849e0ce686dc75840101ec64
--- sources/gui/qml/compounds/ValueAdjuster.qml	(.../ValueAdjuster.qml)	(revision da2dbdbd92d099e44d11bbfb2b794d5ee19a0f0a)
+++ sources/gui/qml/compounds/ValueAdjuster.qml	(.../ValueAdjuster.qml)	(revision 02f5bd9c52c936b9849e0ce686dc75840101ec64)
@@ -36,23 +36,28 @@
 
     property bool allowOff      : false
 
+    // fix floating-point precision issue
+    readonly property real stepVal  : Math.round(step       * 10) / 10
+    readonly property real minVal   : Math.round(minimum    * 10) / 10
+    readonly property real val      : Math.round(value      * 10) / 10
+
     onActiveChanged             : if ( active ) { _root.value = _root.defaultValue }
 
     function clear() { _root.active = false }
 
     function increment() {
-        if ( ! active )     { active = true                                                     }
+        if ( ! active )     { active = true                                 }
         else {
-            if ( allowOff ) { _root.value = value < minimum ? minimum : _root.value + _root.step}
-            else            { _root.value += _root.step                                         }
+            if ( allowOff ) { value = val < minVal ? minVal : val + stepVal }
+            else            { value += stepVal                              }
         }
     }
 
     function decrement() {
-        if ( ! active )     { active = true                                                 }
+        if ( ! active )     { active = true                             }
         else {
-            if ( allowOff ) { _root.value = value > minimum ? _root.value - _root.step : 0  }
-            else            { _root.value -= _root.step                                     }
+            if ( allowOff ) { value = val > minVal ? val - stepVal : 0  }
+            else            { value -= stepVal                          }
         }
     }