[gparted] Remove deprecated Glib::thread_init() (!22)

[Curtis Gedak <gedakc src gnome org>]

commit 80d6394684c8276ea99ee97545e4dc7fc8b050b4
Author: Mike Fleetwood <mike fleetwood googlemail com>
Date:   Mon Dec 24 09:52:15 2018 +0000

    Remove deprecated Glib::thread_init() (!22)
    
    Use of Glib::thread_init() was deprecated in glibmm 2.32 [1].  The
    oldest supported distributions have these versions:
        Debian 8           glibmm 2.42.0
        RHEL / CentOS 7    glibmm 2.56.0
        SLES 12            glibmm 2.38.1
        Ubuntu 14.04 LTS   glibmm 2.39.93
    
    Checking further the glibmm 2.32 reference manual says this about
    Glib::thread_init() [2]:
        Initializes the GLib thread system.
    
        Deprecated:
        Calling thread_init() is no longer necessary and no longer has any
        effect.
    
    However only some of the glibmm example programs had Glib::thread_init()
    removed, others had it replaced by Glib::init() [3].  Again the glibmm
    2.32 reference manual says this about Glib::init() [4]:
        Initialize glibmm.
    
        You may call this more than once.  You do not need to call this if
        you are using Glib::MainLoop or Gtk::Main, because they call it for
        you.
    
    GParted does call Gtk::Main and test_PipeCapture does call
    Glib::MainLoop.  Therefore just raise the minimum version to glibmm 2.32
    and remove both calls to Glib::thread_init().
    
    [1] Glibmm 2.32 NEWS file
        https://gitlab.gnome.org/GNOME/glibmm/blob/2.32.0/NEWS#L207
    
    [2] glibmm 2.32, glibmm: Glib Namespace Reference, Glib::thread_init()
        https://developer.gnome.org/glibmm/2.32/namespaceGlib.html#ab26d01c776801f1fff00753e97af4fc7
    
    [3] glibmm commit "Avoid use of deprecates API in tests and examples."
        https://gitlab.gnome.org/GNOME/glibmm/commit/3e0fbb22c0d4814de4174d32e12a45cbad79980e
    
    [4] glibmm 2.32, glibmm: Glib Namespace Reference, Glib::init()
        https://developer.gnome.org/glibmm/2.32/namespaceGlib.html#ac90aee10d0b90e3d8a96a86b5394f87b
    
    Closes !22 - Increase minimums to libparted 2.2 and glibmm 2.32

 configure.ac              |  2 +-
 src/main.cc               |  3 +--
 tests/test_PipeCapture.cc | 10 +++-------
 3 files changed, 5 insertions(+), 10 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index c9a21065..bd5d145c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -205,7 +205,7 @@ AC_SUBST([GTKMM_CFLAGS])
 
 
 dnl Check for glibmm minimum required version.
-PKG_CHECK_MODULES([GLIBMM], [glibmm-2.4 >= 2.14.0])
+PKG_CHECK_MODULES([GLIBMM], [glibmm-2.4 >= 2.32.0])
 
 
 need_cxx_compile_stdcxx_11=no
diff --git a/src/main.cc b/src/main.cc
index d3583175..2c37ec99 100644
--- a/src/main.cc
+++ b/src/main.cc
@@ -17,13 +17,12 @@
 #include "GParted_Core.h"
 #include "Win_GParted.h"
 
+#include <glibmm.h>
 #include <gtkmm/messagedialog.h>
 #include <gtkmm/main.h>
 
 int main( int argc, char *argv[] )
 {
-       //initialize thread system
-       Glib::thread_init() ;
        GParted::GParted_Core::mainthread = Glib::Thread::self();
 
        Gtk::Main kit( argc, argv ) ;
diff --git a/tests/test_PipeCapture.cc b/tests/test_PipeCapture.cc
index 3a8882fe..886ea7fc 100644
--- a/tests/test_PipeCapture.cc
+++ b/tests/test_PipeCapture.cc
@@ -412,18 +412,14 @@ TEST_F( PipeCaptureTest, LineDisciplineSkipCtrlAB )
 
 }  // namespace GParted
 
-// Custom Google Test main() which also initialises the Glib threading system for
-// distributions with glib/glibmm before version 2.32.
-// References:
+// Custom Google Test main().
+// Reference:
 // *   Google Test, Primer, Writing the main() Function
-// *   Deprecated thread API, g_thread_init()
-//     https://developer.gnome.org/glib/stable/glib-Deprecated-Thread-APIs.html#g-thread-init
+//     https://github.com/google/googletest/blob/master/googletest/docs/primer.md#writing-the-main-function
 int main( int argc, char **argv )
 {
        printf("Running main() from %s\n", __FILE__ );
        testing::InitGoogleTest( &argc, argv );
 
-       Glib::thread_init();
-
        return RUN_ALL_TESTS();
 }