package/pulseview: fix build with recent Qt versions

This commit backports an upstream commit to fix the build of pulseview
with recent Qt versions.

Note that pulseview has a 0.4.2 version (newer than our 0.4.1) but it
doesn't have the fix we need. And 0.4.2 now requires additional Qt
translation tools, so the update to 0.4.2 is anyway not
straightforward.

Fixes:

  http://autobuild.buildroot.net/results/c9e27a91905dfda0ba1ddb12c7910316d3ee82ef/

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/pulseview/0002-Replace-obsolete-deprecated-Qt-methods.patch

@@ -0,0 +1,133 @@
+From caacc9bc622238ca48674ea6f40d07466e4b97a5 Mon Sep 17 00:00:00 2001
+From: Valentin Ochs <a@0au.de>
+Date: Sat, 20 Jun 2020 16:01:27 +0200
+Subject: [PATCH] Replace obsolete/deprecated Qt methods
+
+[Thomas: Backport from upstream commit
+ae726b70a7ada9a4be5808e00f0c951318479684, one conflict manually
+resolved in pv/util.cpp.]
+Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
+---
+ pv/util.cpp                     | 21 +++++++++++++++++++--
+ pv/util.hpp                     | 10 ++++++++++
+ pv/views/trace/decodetrace.cpp  |  3 ++-
+ pv/views/trace/ruler.cpp        |  2 +-
+ pv/widgets/timestampspinbox.cpp |  2 +-
+ 5 files changed, 33 insertions(+), 5 deletions(-)
+
+diff --git a/pv/util.cpp b/pv/util.cpp
+index 49b9467c..2a63038d 100644
+--- a/pv/util.cpp
++++ b/pv/util.cpp
+@@ -137,7 +137,7 @@ QString format_time_si(const Timestamp& v, SIPrefix prefix,
+ 	QString s;
+ 	QTextStream ts(&s);
+ 	if (sign && !v.is_zero())
+-		ts << forcesign;
++		ts.setNumberFlags(ts.numberFlags() | QTextStream::ForceSign);
+ 	ts << qSetRealNumberPrecision(precision) << (v * multiplier) << ' '
+ 		<< prefix << unit;
+ 
+@@ -171,7 +171,7 @@ QString format_value_si(double v, SIPrefix prefix, unsigned precision,
+ 	QString s;
+ 	QTextStream ts(&s);
+ 	if (sign && (v != 0))
+-		ts << forcesign;
++		ts.setNumberFlags(ts.numberFlags() | QTextStream::ForceSign);
+ 	ts.setRealNumberNotation(QTextStream::FixedNotation);
+ 	ts.setRealNumberPrecision(precision);
+ 	ts << (v * multiplier) << ' ' << prefix << unit;
+@@ -281,5 +281,22 @@ vector<string> split_string(string text, string separator)
+ 	return result;
+ }
+ 
++/**
++ * Return the width of a string in a given font.
++ *
++ * @param[in] metric metrics of the font
++ * @param[in] string the string whose width should be determined
++ *
++ * @return width of the string in pixels
++ */
++std::streamsize text_width(const QFontMetrics &metric, const QString &string)
++{
++#if QT_VERSION >= QT_VERSION_CHECK(5, 11, 0)
++	return metric.horizontalAdvance(string);
++#else
++	return metric.width(string);
++#endif
++}
++
+ } // namespace util
+ } // namespace pv
+diff --git a/pv/util.hpp b/pv/util.hpp
+index dd7be222..ad904f85 100644
+--- a/pv/util.hpp
++++ b/pv/util.hpp
+@@ -30,6 +30,7 @@
+ 
+ #include <QMetaType>
+ #include <QString>
++#include <QFontMetrics>
+ 
+ using std::string;
+ using std::vector;
+@@ -137,6 +138,15 @@ QString format_time_minutes(const Timestamp& t, signed precision = 0,
+ 
+ vector<string> split_string(string text, string separator);
+ 
++/**
++ * Return the width of a string in a given font.
++ * @param[in] metric metrics of the font
++ * @param[in] string the string whose width should be determined
++ *
++ * @return width of the string in pixels
++ */
++std::streamsize text_width(const QFontMetrics &metric, const QString &string);
++
+ } // namespace util
+ } // namespace pv
+ 
+diff --git a/pv/views/trace/decodetrace.cpp b/pv/views/trace/decodetrace.cpp
+index 9c7196bf..1ee7ae9f 100644
+--- a/pv/views/trace/decodetrace.cpp
++++ b/pv/views/trace/decodetrace.cpp
+@@ -103,7 +103,8 @@ DecodeTrace::DecodeTrace(pv::Session &session,
+ 
+ 	// Determine shortest string we want to see displayed in full
+ 	QFontMetrics m(QApplication::font());
+-	min_useful_label_width_ = m.width("XX"); // e.g. two hex characters
++	// e.g. two hex characters
++	min_useful_label_width_ = util::text_width(m, "XX");
+ 
+ 	// For the base color, we want to start at a very different color for
+ 	// every decoder stack, so multiply the index with a number that is
+diff --git a/pv/views/trace/ruler.cpp b/pv/views/trace/ruler.cpp
+index acea8a36..68134966 100644
+--- a/pv/views/trace/ruler.cpp
++++ b/pv/views/trace/ruler.cpp
+@@ -218,7 +218,7 @@ void Ruler::paintEvent(QPaintEvent*)
+ 		const int rightedge = width();
+ 		const int x_tick = tick.first;
+ 		if ((x_tick > leftedge) && (x_tick < rightedge)) {
+-			const int x_left_bound = QFontMetrics(font()).width(tick.second) / 2;
++			const int x_left_bound = util::text_width(QFontMetrics(font()), tick.second) / 2;
+ 			const int x_right_bound = rightedge - x_left_bound;
+ 			const int x_legend = min(max(x_tick, x_left_bound), x_right_bound);
+ 			p.drawText(x_legend, ValueMargin, 0, text_height,
+diff --git a/pv/widgets/timestampspinbox.cpp b/pv/widgets/timestampspinbox.cpp
+index 21b3d0d7..383aed1f 100644
+--- a/pv/widgets/timestampspinbox.cpp
++++ b/pv/widgets/timestampspinbox.cpp
+@@ -75,7 +75,7 @@ QSize TimestampSpinBox::minimumSizeHint() const
+ {
+ 	const QFontMetrics fm(fontMetrics());
+ 	const int l = round(value_).str().size() + precision_ + 10;
+-	const int w = fm.width(QString(l, '0'));
++	const int w = util::text_width(fm, QString(l, '0'));
+ 	const int h = lineEdit()->minimumSizeHint().height();
+ 	return QSize(w, h);
+ }
+-- 
+2.26.2
+