Make navigate_frame command respect a count prefix

README.md

@@ -122,7 +122,7 @@ of small previews is displayed, making it easy to choose an image to open.
     n,Space      Go [count] images forward
     p,Backspace  Go [count] images backward
     [,]          Go [count] * 10 images backward/forward
-    Ctrl-n,p     Go to the next/previous frame of a multi-frame image
+    Ctrl-n,p     Go [count] frames of a multi-frame image forward/backward
     Ctrl-Space   Play/stop animations of multi-frame images
     h,j,k,l      Scroll image 1/5 of window width/height or [count] pixels
                  left/down/up/right (also with arrow keys)

commands.c

@@ -289,6 +289,8 @@ bool ci_alternate(arg_t _)
 
 bool ci_navigate_frame(arg_t d)
 {
+	if (prefix > 0)
+		d *= prefix;
 	return !img.multi.animate && img_frame_navigate(&img, d);
 }
 

sxiv.1

@@ -228,10 +228,14 @@ Go
 .SS Handle multi-frame images
 .TP
 .B Ctrl-n
-Go to the next frame of a multi-frame image.
+Go
+.I count
+frames of a multi-frame image forward.
 .TP
 .B Ctrl-p
-Go to the previous frame of a multi-frame image.
+Go
+.I count
+frames of a multi-frame image backward.
 .TP
 .B Ctrl-Space
 Play/stop animations of multi-frame images.