tdeui: Update slider parameters together with changing precision of KDoubleNumInput

This relates to bug 2717 and resolves bug 2758

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit 2a8932682f)

tdeui/knuminput.cpp

@@ -769,7 +769,6 @@ void KDoubleNumInput::setRange(double lower, double upper, double step,
 	int slstep = spin->lineStep();
         if (m_slider) {
             m_slider->setRange(slmin, slmax);
-	    m_slider->setLineStep(slstep);
             m_slider->setValue(slvalue);
         } else {
             m_slider = new TQSlider(slmin, slmax, slstep, slvalue,
@@ -784,6 +783,7 @@ void KDoubleNumInput::setRange(double lower, double upper, double step,
 	// calculate ( slmax - slmin ) / 10 without overflowing ints:
 	int major = calcDiffByTen( slmax, slmin );
 	if ( !major ) major = slstep; // ### needed?
+	m_slider->setSteps(slstep, major);
         m_slider->setTickInterval(major);
     } else {
         delete m_slider;
@@ -859,6 +859,16 @@ void KDoubleNumInput::setPrefix(const TQString &prefix)
 void KDoubleNumInput::setPrecision(int precision)
 {
     d->spin->setPrecision( precision );
+    if(m_slider) {
+        // upcast to base type to get the min/maxValue in int form:
+        TQSpinBox * spin = d->spin;
+        m_slider->setRange(spin->minValue(), spin->maxValue());
+        m_slider->setValue(spin->value());
+        int major = calcDiffByTen(spin->maxValue(), spin->minValue());
+        if ( !major ) major = spin->lineStep();
+        m_slider->setSteps(spin->lineStep(), major);
+        m_slider->setTickInterval(major);
+    }
 
     layout(true);
 }