diff -r 41300fa6a67c -r f7bc934e204c src/gui/widgets/qspinbox.cpp
--- a/src/gui/widgets/qspinbox.cpp	Tue Feb 02 00:43:10 2010 +0200
+++ b/src/gui/widgets/qspinbox.cpp	Wed Mar 31 11:06:36 2010 +0300
@@ -1,6 +1,6 @@
 /****************************************************************************
 **
-** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
 ** All rights reserved.
 ** Contact: Nokia Corporation (qt-info@nokia.com)
 **
@@ -99,6 +99,10 @@
         Q_Q(QDoubleSpinBox);
         q->setInputMethodHints(Qt::ImhFormattedNumbersOnly);
     }
+
+    // When fiddling with the decimals property, we may lose precision in these properties.
+    double actualMin;
+    double actualMax;
 };
 
 
@@ -444,11 +448,12 @@
 }
 
 /*!
-    This virtual function is used by the spin box whenever it needs
-    to display the given \a value. The default implementation returns
-    a string containing \a value printed in the standard way using
-    QWidget::locale().toString(). Reimplementations may return anything. (See
-    the example in the detailed description.)
+    This virtual function is used by the spin box whenever it needs to
+    display the given \a value. The default implementation returns a
+    string containing \a value printed in the standard way using
+    QWidget::locale().toString(), but with the thousand separator
+    removed. Reimplementations may return anything. (See the example
+    in the detailed description.)
 
     Note: QSpinBox does not call this function for specialValueText()
     and that neither prefix() nor suffix() should be included in the
@@ -457,7 +462,7 @@
     If you reimplement this, you may also need to reimplement
     valueFromText() and validate()
 
-    \sa valueFromText(), validate()
+    \sa valueFromText(), validate(), QLocale::groupSeparator()
 */
 
 QString QSpinBox::textFromValue(int value) const
@@ -762,6 +767,7 @@
 void QDoubleSpinBox::setMinimum(double minimum)
 {
     Q_D(QDoubleSpinBox);
+    d->actualMin = minimum;
     const QVariant m(d->round(minimum));
     d->setRange(m, (d->variantCompare(d->maximum, m) > 0 ? d->maximum : m));
 }
@@ -792,6 +798,7 @@
 void QDoubleSpinBox::setMaximum(double maximum)
 {
     Q_D(QDoubleSpinBox);
+    d->actualMax = maximum;
     const QVariant m(d->round(maximum));
     d->setRange((d->variantCompare(d->minimum, m) < 0 ? d->minimum : m), m);
 }
@@ -813,6 +820,8 @@
 void QDoubleSpinBox::setRange(double minimum, double maximum)
 {
     Q_D(QDoubleSpinBox);
+    d->actualMin = minimum;
+    d->actualMax = maximum;
     d->setRange(QVariant(d->round(minimum)), QVariant(d->round(maximum)));
 }
 
@@ -843,7 +852,7 @@
     Q_D(QDoubleSpinBox);
     d->decimals = qBound(0, decimals, DBL_MAX_10_EXP + DBL_DIG);
 
-    setRange(minimum(), maximum()); // make sure values are rounded
+    setRange(d->actualMin, d->actualMax); // make sure values are rounded
     setValue(value());
 }
 
@@ -861,7 +870,7 @@
     If you reimplement this, you may also need to reimplement
     valueFromText().
 
-    \sa valueFromText()
+    \sa valueFromText(), QLocale::groupSeparator()
 */
 
 
@@ -1051,8 +1060,10 @@
 
 QDoubleSpinBoxPrivate::QDoubleSpinBoxPrivate()
 {
-    minimum = QVariant(0.0);
-    maximum = QVariant(99.99);
+    actualMin = 0.0;
+    actualMax = 99.99;
+    minimum = QVariant(actualMin);
+    maximum = QVariant(actualMax);
     value = minimum;
     singleStep = QVariant(1.0);
     decimals = 2;