[gnome-screenshot] backend-shell: Use /tmp to save temporary file

[Alexander Mikhaylenko <alexm src gnome org>]

commit a69f5eefb4855218f87262fd44de96903f7ca508
Author: Koki Fukuda <ko fu dev gmail com>
Date:   Wed Nov 25 00:53:54 2020 +0900

    backend-shell: Use /tmp to save temporary file
    
    It is likely that /tmp uses tmpfs, in-memory filesystem.
    So, save temporary file generated by shell to directory in /tmp
    to reduce disk access.

 src/screenshot-backend-shell.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/src/screenshot-backend-shell.c b/src/screenshot-backend-shell.c
index 84c5ead..9c686d1 100644
--- a/src/screenshot-backend-shell.c
+++ b/src/screenshot-backend-shell.c
@@ -42,13 +42,14 @@ screenshot_backend_shell_get_pixbuf (ScreenshotBackend *backend,
                                      GdkRectangle      *rectangle)
 {
   g_autoptr(GError) error = NULL;
-  g_autofree gchar *path = NULL, *filename = NULL, *tmpname = NULL;
+  g_autofree gchar *tmp_dirname = NULL, *path = NULL, *filename = NULL, *tmpname = NULL;
   GdkPixbuf *screenshot = NULL;
   const gchar *method_name;
   GVariant *method_params;
   GDBusConnection *connection;
 
-  path = g_build_filename (g_get_user_cache_dir (), "gnome-screenshot", NULL);
+  tmp_dirname = g_strdup_printf ("gnome-screenshot-%s", g_get_user_name ());
+  path = g_build_filename (g_get_tmp_dir (), tmp_dirname, NULL);
   g_mkdir_with_parents (path, 0700);
 
   tmpname = g_strdup_printf ("scr-%d.png", g_random_int ());