gui/main-window: exit program when config not writable

Note, it opens the config in read-write mode to check if it's
writable. This might present a race condition when config is
saved.

However, we're expecting all config saving to be done in the
user interface thread. Add a check for it however.

1 files changed, 1 insertions, 0 deletions

diff --git a/options/group.hpp b/options/group.hpp
index f5b3e523..82b508af 100644
--- a/options/group.hpp
+++ b/options/group.hpp
@@ -26,6 +26,7 @@ public:
     static QString ini_directory();
     static QString ini_filename();
     static QString ini_pathname();
+    static QString ini_combine(const QString& filename);
     static QStringList ini_list();
     static std::shared_ptr<QSettings> ini_file();