Make a path for GTK settings if it does not exist.

Summary: Can't change GTK3 theme in lxqt-config-appearance if settings don't exist, so create it.

Test Plan:
 1. Open lxqt-config-appearance
 1. Check "Set GTK themes"
 1. Change "GTK 3 Theme" to Arc
 1. Close lxqt-config-appearance
 1. Open lxqt-config-appearance

"GTK 3 Theme" should be set to Arc and not the default, Adwaita.

Reviewers: tsimonq2

Reviewed By: tsimonq2

Differential Revision: https://phab.lubuntu.me/D13

debian/changelog

@@ -1,3 +1,9 @@
+lxqt-config (0.13.0-0ubuntu4) cosmic; urgency=medium
+
+  * Make a path for GTK settings if it does not exist.
+
+ -- Walter Lapchynski <wxl@ubuntu.com>  Mon, 03 Sep 2018 07:43:25 +0000
+
 lxqt-config (0.13.0-0ubuntu3) cosmic; urgency=medium
 
   * Run wrap-and-sort.

debian/patches/mkpath-for-null-gtk-settings.patch

@@ -0,0 +1,18 @@
+Description: Make a path for GTK settings if it does not exist.
+Author: P.L. Lucas <selairi@gmail.com>
+Bug: https://github.com/lxqt/lxqt/issues/1548
+Applied-Upstream: https://github.com/lxqt/lxqt-config/commit/5fe0f9288e432a669686af14657b7f508eefb77e
+Last-Update: 2018-09-03
+--- a/lxqt-config-appearance/configothertoolkits.cpp
++++ b/lxqt-config-appearance/configothertoolkits.cpp
+@@ -212,6 +212,10 @@ void ConfigOtherToolKits::writeConfig(QS
+     path = _get_config_path(path);
+ 
+     QFile file(path);
++    if(! file.exists()) {
++        QFileInfo fileInfo(file);
++        QDir::home().mkpath(fileInfo.path());
++    }
+     if (!file.open(QIODevice::WriteOnly | QIODevice::Text)) {
+         return;
+     }

debian/patches/series

@@ -1 +1,2 @@
 gtk-appearance-settings.patch
+mkpath-for-null-gtk-settings.patch