Better support of decimals change in ctkCoordinatesWidget

The number of decimals can be changed from the ctkDoubleSpinBox
directly. Let's make sure the new number of decimals is not overwritten
by the coordinates widget.

Libs/Widgets/ctkCoordinatesWidget.cpp

@@ -295,6 +295,8 @@ void ctkCoordinatesWidget::setCoordinates(double* coordinates)
     {
     this->normalize(this->Coordinates, this->Dimension);
     }
+  bool valuesModified = false;
+  int maxDecimals = 0;
   bool blocked = this->blockSignals(true);
   for (int i = 0; i < this->Dimension; ++i)
     {
@@ -305,13 +307,22 @@ void ctkCoordinatesWidget::setCoordinates(double* coordinates)
       {
       // we don't want updateCoordinate() to be called.
       // it could mess with the LastUserEditedCoordinates list.
-      bool spinBoxSignalWasBlocked = spinBox->blockSignals(true);
-      spinBox->setValue(this->Coordinates[i]);
-      spinBox->blockSignals(spinBoxSignalWasBlocked);
+      if (spinBox->displayedValue() != this->Coordinates[i])
+        {
+        bool spinBoxSignalWasBlocked = spinBox->blockSignals(true);
+        spinBox->setValue(this->Coordinates[i]);
+        spinBox->blockSignals(spinBoxSignalWasBlocked);
+        valuesModified = true;
+        }
+      maxDecimals = qMax(maxDecimals, spinBox->decimals());
       }
     }
   this->blockSignals(blocked);
-  this->updateCoordinates();
+  if (valuesModified)
+    {
+    this->setDecimals(maxDecimals);
+    this->updateCoordinates();
+    }
 }
 
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