always redraw images

Previously when covering the sent window with an image slide selected and
exposing it again, the image was lost. This change always redraws the image and
also removes the now redundant bit flag in the state enum.

sent.c

@@ -33,7 +33,6 @@ char *argv0;
 typedef enum {
 	NONE = 0,
 	SCALED = 1,
-	DRAWN = 2
 } imgstate;
 
 typedef struct {
@@ -320,7 +319,6 @@ ffdraw(Image *img)
 	XPutImage(xw.dpy, xw.win, d->gc, img->ximg, 0, 0,
 	          xoffset, yoffset, img->ximg->width, img->ximg->height);
 	XFlush(xw.dpy);
-	img->state |= DRAWN;
 }
 
 void
@@ -441,7 +439,7 @@ advance(const Arg *arg)
 	LIMIT(new_idx, 0, slidecount-1);
 	if (new_idx != idx) {
 		if (slides[idx].img)
-			slides[idx].img->state &= ~(DRAWN | SCALED);
+			slides[idx].img->state &= ~SCALED;
 		idx = new_idx;
 		ffload(&slides[idx]);
 		xdraw();
@@ -514,8 +512,7 @@ xdraw()
 	} else {
 		if (!(im->state & SCALED))
 			ffprepare(im);
-		if (!(im->state & DRAWN))
-			ffdraw(im);
+		ffdraw(im);
 	}
 }
 
@@ -645,7 +642,7 @@ configure(XEvent *e)
 {
 	resize(e->xconfigure.width, e->xconfigure.height);
 	if (slides[idx].img)
-		slides[idx].img->state &= ~(DRAWN | SCALED);
+		slides[idx].img->state &= ~SCALED;
 	xdraw();
 }