Feature: --no-fading-openclose to partially simulate -F

-F hasn't being working for long. This commit adds a switch
--no-fading-openclose (and a configuration file option of the same name)
to simulate the behavior when only -F is enabled, which disables fading
when opening/closing windows, and makes -F an alias for -f.

src/compton.h

@@ -270,7 +270,7 @@ typedef struct _options {
   /// How much to fade out in a single fading step.
   opacity_t fade_out_step;
   unsigned long fade_delta;
-  Bool fade_trans;
+  Bool no_fading_openclose;
   /// Fading blacklist. A linked list of conditions.
   wincond *fade_blacklist;
 
@@ -725,6 +725,9 @@ map_win(Display *dpy, Window id,
         unsigned long sequence, Bool fade,
         Bool override_redirect);
 
+static void
+finish_map_win(Display *dpy, win *w);
+
 static void
 finish_unmap_win(Display *dpy, win *w);