[gtk+] Add a main category to desktop files

[Matthias Clasen <matthiasc src gnome org>]

commit 90a8118838ddb38aa31ab1abb7989387cefc1698
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu May 14 15:26:56 2015 -0400

    Add a main category to desktop files
    
    This makes desktop-file-validate happy.

 demos/gtk-demo/gtk3-demo.desktop                 |    2 +-
 demos/icon-browser/gtk3-icon-browser.desktop     |    2 +-
 demos/widget-factory/gtk3-widget-factory.desktop |    2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/demos/gtk-demo/gtk3-demo.desktop b/demos/gtk-demo/gtk3-demo.desktop
index 9747813..0b03708 100644
--- a/demos/gtk-demo/gtk3-demo.desktop
+++ b/demos/gtk-demo/gtk3-demo.desktop
@@ -6,5 +6,5 @@ Icon=gtk3-demo
 Terminal=false
 Type=Application
 StartupNotify=true
-Categories=GTK;
+Categories=Development;GTK;
 NoDisplay=true
diff --git a/demos/icon-browser/gtk3-icon-browser.desktop b/demos/icon-browser/gtk3-icon-browser.desktop
index 1a329f7..c1a546e 100644
--- a/demos/icon-browser/gtk3-icon-browser.desktop
+++ b/demos/icon-browser/gtk3-icon-browser.desktop
@@ -6,5 +6,5 @@ Icon=gtk3-icon-browser
 Terminal=false
 Type=Application
 StartupNotify=true
-Categories=GTK;
+Categories=Development;GTK;
 NoDisplay=true
diff --git a/demos/widget-factory/gtk3-widget-factory.desktop 
b/demos/widget-factory/gtk3-widget-factory.desktop
index e20f810..fecdcd0 100644
--- a/demos/widget-factory/gtk3-widget-factory.desktop
+++ b/demos/widget-factory/gtk3-widget-factory.desktop
@@ -6,5 +6,5 @@ Icon=gtk3-widget-factory
 Terminal=false
 Type=Application
 StartupNotify=true
-Categories=GTK;
+Categories=Development;GTK;
 NoDisplay=true