[niepce] ui: the default icon for the list store is now static

[Hubert Figuière <hub src gnome org>]

commit 45113ce7fe6158938e3a5ac9d4bb75f512cb7caf
Author: Hubert Figuière <hub figuiere net>
Date:   Sat Jan 18 00:17:35 2020 -0500

    ui: the default icon for the list store is now static

 src/niepce/ui/imageliststore.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/niepce/ui/imageliststore.cpp b/src/niepce/ui/imageliststore.cpp
index 64f93e1..a59befb 100644
--- a/src/niepce/ui/imageliststore.cpp
+++ b/src/niepce/ui/imageliststore.cpp
@@ -35,8 +35,8 @@ namespace ui {
 
 Glib::RefPtr<Gdk::Pixbuf> ImageListStore::get_loading_icon()
 {
-    Glib::RefPtr<Gdk::Pixbuf> icon;
-    if(!icon) {
+    static Glib::RefPtr<Gdk::Pixbuf> icon;
+    if (!icon) {
         static std::mutex m;
         m.lock();
         if (!icon) {