QDom: use correct precision when converting float/double values

d7cb21ac085117f879a8aa1d7727b2ca52d3353d change the way a double is
converted which resulted in less precision.
Fix it by explictily setting the precision in QString::setNum()

Task-number: QTBUG-80068
Change-Id: I1fd9d00837155ceb707e84bfeb9deff03b5ab57e
Reviewed-by: André Hartmann <aha_1980@gmx.de>
Reviewed-by: Konstantin Shegunov <kshegunov@gmail.com>
Reviewed-by: Lars Knoll <lars.knoll@qt.io>

1 files changed, 4 insertions, 3 deletions

diff --git a/src/xml/dom/qdom.cpp b/src/xml/dom/qdom.cpp
index 04151c3f31..04331527f9 100644
--- a/src/xml/dom/qdom.cpp
+++ b/src/xml/dom/qdom.cpp
@@ -62,6 +62,7 @@
 #include <qshareddata.h>
 #include <qdebug.h>
 #include <stdio.h>
+#include <limits>
 
 QT_BEGIN_NAMESPACE
 
@@ -4866,7 +4867,7 @@ void QDomElement::setAttribute(const QString& name, float value)
     if (!impl)
         return;
     QString x;
-    x.setNum(value);
+    x.setNum(value, 'g', 8);
     IMPL->setAttribute(name, x);
 }
 
@@ -4880,7 +4881,7 @@ void QDomElement::setAttribute(const QString& name, double value)
     if (!impl)
         return;
     QString x;
-    x.setNum(value);
+    x.setNum(value, 'g', 17);
     IMPL->setAttribute(name, x);
 }
 
@@ -5049,7 +5050,7 @@ void QDomElement::setAttributeNS(const QString nsURI, const QString& qName, doub
     if (!impl)
         return;
     QString x;
-    x.setNum(value);
+    x.setNum(value, 'g', 17);
     IMPL->setAttributeNS(nsURI, qName, x);
 }