[gtksourceview] build: bump GTK requirement to >= 3.22

[Christian Hergert <chergert src gnome org>]

commit 1f91fe6afedc637b29d2e8fb7cf40f133355f76b
Author: Christian Hergert <chergert redhat com>
Date:   Thu Apr 25 20:46:50 2019 -0700

    build: bump GTK requirement to >= 3.22
    
    This bumps the GTK requirement to 3.22 so that we can start the process
    of removing deprecations. For distributions wanting updates to
    GtkSourceView without the ability to use GTK 3.22, the gtksourceview-4-2
    will continue to provide that for you.
    
    However, primary development must now start to think about what a
    GtkSourceView will look like with GTK 4.x, and the first step is to
    start removing deprecations.

 meson.build | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index c6c34259..d6fa1d61 100644
--- a/meson.build
+++ b/meson.build
@@ -61,10 +61,12 @@ build_gtk_doc = get_option('gtk_doc')
 # Dependencies
 cc = meson.get_compiler('c')
 
+gtk_req_version = '3.22'
+
 libm_dep = cc.find_library('m', required: false)
 
 glib_req = '>= 2.48'
-gtk_req = '>= 3.20'
+gtk_req = '>= @0@'.format(gtk_req_version)
 libxml_req = '>= 2.6'
 gladeui_req = '>= 3.9'
 introspection_req  = '>= 1.42.0'
@@ -121,12 +123,18 @@ endif
 
 xmllint_prg = find_program('xmllint', required: false)
 
+gtk_version_arr = gtk_req_version.split('.')
+gtk_major_version = gtk_version_arr[0]
+gtk_minor_version = gtk_version_arr[1]
+
 # Configurations
 add_project_arguments([
   '-DG_DISABLE_DEPRECATED',
   '-DGDK_DISABLE_DEPRECATED',
   '-DGTK_DISABLE_DEPRECATED',
   '-DGDK_PIXBUF_DISABLE_DEPRECATED',
+  '-DGDK_VERSION_MIN_REQUIRED=GDK_VERSION_@0@_@1@'.format(gtk_major_version, gtk_minor_version),
+  '-DGDK_VERSION_MAX_ALLOWED=GDK_VERSION_@0@_@1@'.format(gtk_major_version, gtk_minor_version),
 ], language: 'c')
 
 config_h = configuration_data()