Add QDebug convenience for changing the verbosity level

qDebug().nospace().verbosity(3) << myObj;

Change-Id: Idea3094294d1afbff302e472e47a55a01d3b7735
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/corelib/io/qdebug.cpp

@@ -475,6 +475,17 @@ QDebug &QDebug::resetFormat()
     \sa verbosity()
 */
 
+/*!
+    \fn QDebug &QDebug::verbosity(int verbosityLevel)
+    \since 5.13
+
+    Sets the verbosity of the stream to \a verbosityLevel and returns a reference to the stream.
+
+    The allowed range is from 0 to 7. The default value is 2.
+
+    \sa verbosity(), setVerbosity()
+*/
+
 /*!
     \fn QDebug &QDebug::operator<<(QChar t)
 

src/corelib/io/qdebug.h

@@ -123,6 +123,7 @@ public:
     inline QDebug &space() { stream->space = true; stream->ts << ' '; return *this; }
     inline QDebug &nospace() { stream->space = false; return *this; }
     inline QDebug &maybeSpace() { if (stream->space) stream->ts << ' '; return *this; }
+    inline QDebug &verbosity(int verbosityLevel) { setVerbosity(verbosityLevel); return *this; }
     int verbosity() const { return stream->verbosity(); }
     void setVerbosity(int verbosityLevel) { stream->setVerbosity(verbosityLevel); }
 
@@ -195,6 +196,7 @@ public:
     inline QNoDebug &quote() { return *this; }
     inline QNoDebug &noquote() { return *this; }
     inline QNoDebug &maybeQuote(const char = '"') { return *this; }
+    inline QNoDebug &verbosity(int) { return *this; }
 
     template<typename T>
     inline QNoDebug &operator<<(const T &) { return *this; }