Officially require Qt 4.8 or newer

Since v2.3.0rc0-1002-g1cd2255, Qt 4.8 became mandatory, reflect this in
the version requirements. This will not affect a lot of distributions
(RHEL and SLES only had Qt 4.6).

For a more complete list of supported platforms, see
https://wiki.wireshark.org/Development/Support_library_version_tracking

While at it, correct some other minimum versions in documentation.

Change-Id: I11f2dfba72c75429f6838404a81ed3b3dc302d5f
Reviewed-on: https://code.wireshark.org/review/18314
Reviewed-by: Michal Labedzki <michal.labedzki@tieto.com>
Petri-Dish: Anders Broman <a.broman58@gmail.com>
Reviewed-by: Anders Broman <a.broman58@gmail.com>

CMakeLists.txt

@@ -772,7 +772,7 @@ if(BUILD_wireshark)
 		set(QT_VERSION 5)
 	else()
 		set(PACKAGELIST ${PACKAGELIST} Qt4)
-		set(Qt4_OPTIONS 4.7.1 REQUIRED QtCore QtGui)
+		set(Qt4_OPTIONS 4.8 REQUIRED QtCore QtGui)
 		set(QT_VERSION 4)
 	endif()
 endif()

configure.ac

@@ -1237,7 +1237,7 @@ GTK2_MIN_VERSION=2.12.0
 AC_SUBST(GTK2_MIN_VERSION)
 GTK3_MIN_VERSION=3.0.0
 AC_SUBST(GTK3_MIN_VERSION)
-QT_MIN_VERSION=4.7.0
+QT_MIN_VERSION=4.8.0
 AC_SUBST(QT_MIN_VERSION)
 # GTK+ and Qt checks; we require GTK+ $GTK2_MIN_VERSION or later or
 # GTK3_MIN_VERSION or later or Qt $QT_MIN_VERSION or later.
@@ -1249,37 +1249,8 @@ AC_SUBST(QT_MIN_VERSION)
 # We don't add $GTK_LIBS or $Qt_LIBS to LIBS, because we don't want to
 # force all programs to be built with GTK+ or Qt.
 #
-# Release dates for GTK+ versions:
-# https://en.wikipedia.org/wiki/GTK+#Releases
-# 2.12.0: 14 Sep 2007
-# 2.14.0: 04 Sep 2008
-# 2.16.0: 13 Mar 2009
-# 2.18.0: 23 Sep 2009
-# 2.20.0: 23 Mar 2010
-# 2.22.0: 23 Sep 2010
-# 2.24.0: 30 Jan 2011
-# 3.0.0:  10 Feb 2011
-# 3.2.0:  25 Sep 2011
-# 3.4.0:  26 Mar 2012
-# 3.6.0:  24 Sep 2012
-# 3.8.0:  25 Mar 2013
-# 3.10.0: 23 Sep 2013
-# 3.12.0: 25 Mar 2014
-# 3.14.0: 30 Sep 2014
-# 3.16.0: 22 Mar 2015
-# 3.18.0  22 Sep 2015
-#
-# Release dates for Qt versions:
-# https://en.wikipedia.org/wiki/List_of_Qt_releases
-# 4.6.0:  01 Dec 2009
-# 4.7.0:  21 Sep 2010
-# 4.8.0:  15 Dec 2011
-# 5.0.0:  19 Dec 2012
-# 5.1.0:  03 Jul 2013
-# 5.2.0:  12 Dec 2013
-# 5.3.0:  20 May 2014
-# 5.4.0:  10 Dec 2015
-# 5.5.0:  01 Jul 2015
+# For a list of library versions and their support across different platforms,
+# see https://wiki.wireshark.org/Development/Support_library_version_tracking
 
 have_qt=no
 have_gtk=no

doc/README.developer

@@ -387,11 +387,10 @@ tmpnam is insecure and should not be used any more. Wireshark brings its
 own mkstemp implementation for use on platforms that lack mkstemp.
 Note: mkstemp does not accept NULL as a parameter.
 
-Wireshark supports platforms with GLib 2.16[.x]/GTK+ 2.12[.x]/Qt 4.7[.x] or
-newer. If a Glib/GTK+/Qt mechanism is available only in Glib/GTK+/Qt
-versions newer than 2.16/2.12/4.7 then use "#if GLIB_CHECK_VERSION(...)",
-"#if GTK_CHECK_VERSION(...)" or "#if QT_VERSION_CHECK(...)" to conditionally
-compile code using that mechanism.
+Wireshark supports platforms with GLib 2.22[.x]/GTK+ 2.12[.x]/Qt 4.8[.x] or
+newer. If a Glib/GTK+/Qt mechanism is available only in newer Glib/GTK+/Qt
+versions then use "#if GLIB_CHECK_VERSION(...)", "#if GTK_CHECK_VERSION(...)" or
+"#if QT_VERSION_CHECK(...)" to conditionally compile code using that mechanism.
 
 When different code must be used on UN*X and Win32, use a #if or #ifdef
 that tests _WIN32, not WIN32.  Try to write code portably whenever

ui/qt/font_color_preferences_frame.cpp

@@ -81,15 +81,9 @@ void FontColorPreferencesFrame::updateWidgets()
 {
     int margin = style()->pixelMetric(QStyle::PM_LayoutLeftMargin);
 
-#if QT_VERSION < QT_VERSION_CHECK(4, 8, 0)
-    ui->fontPushButton->setText(
-                cur_font_.family() + " " +
-                QString::number(cur_font_.pointSizeF(), 'f', 1));
-#else
     ui->fontPushButton->setText(
                 cur_font_.family() + " " + cur_font_.styleName() + " " +
                 QString::number(cur_font_.pointSizeF(), 'f', 1));
-#endif
     ui->fontSampleLineEdit->setFont(cur_font_);
 
     QString line_edit_ss = QString("QLineEdit { margin-left: %1px; }").arg(margin);

ui/qt/proto_tree.cpp

@@ -572,11 +572,7 @@ void ProtoTree::itemDoubleClick(QTreeWidgetItem *item, int) {
     if (!fi || !fi->hfinfo) return;
 
     if(fi->hfinfo->type == FT_FRAMENUM) {
-#if QT_VERSION >= QT_VERSION_CHECK(4, 8, 0)
         if (QApplication::queryKeyboardModifiers() & Qt::ShiftModifier) {
-#else
-        if (QApplication::keyboardModifiers() & Qt::ShiftModifier) {
-#endif
             emit openPacketInNewWindow(true);
         } else {
             emit goToPacket(fi->value.value.uinteger);

ui/qt/qt_ui_utils.cpp

@@ -192,11 +192,7 @@ QString html_escape(const QString plain_string) {
 
 void smooth_font_size(QFont &font) {
     QFontDatabase fdb;
-#if QT_VERSION < QT_VERSION_CHECK(4, 8, 0)
-    QList<int> size_list = fdb.smoothSizes(font.family(), "");
-#else
     QList<int> size_list = fdb.smoothSizes(font.family(), font.styleName());
-#endif
 
     if (size_list.size() < 2) return;
 

ui/qt/stock_icon.cpp

@@ -75,18 +75,14 @@ StockIcon::StockIcon(const QString icon_name) :
     // X11 only as per the QIcon documentation.
     if (hasThemeIcon(icon_name)) {
         QIcon theme_icon = fromTheme(icon_name);
-#if QT_VERSION >= QT_VERSION_CHECK(4, 8, 0)
         swap(theme_icon);
-#endif
         return;
     }
 
     // Is this is an icon we've manually mapped to a standard pixmap below?
     if (icon_name_to_standard_pixmap_.contains(icon_name)) {
         QIcon standard_icon = wsApp->style()->standardIcon(icon_name_to_standard_pixmap_[icon_name]);
-#if QT_VERSION >= QT_VERSION_CHECK(4, 8, 0)
         swap(standard_icon);
-#endif
         return;
     }