Some minor fixups...

On expose, always redraw the entire screen.  The calculations were
wrong and with fractional scaling, some of them will always be wrong.

Don't clear the screen when xim is resized.

src/conio/x_events.c

@@ -715,7 +715,6 @@ static void resize_xim(void)
 				release_buffer(last);
 				last = NULL;
 			}
-			x11.XFillRectangle(dpy, win, gc, 0, 0, width, height);
 			return;
 		}
 #ifdef XDestroyImage
@@ -730,7 +729,6 @@ static void resize_xim(void)
 	}
 	xim = x11.XCreateImage(dpy, visual, depth, ZPixmap, 0, NULL, width, height, 32, 0);
 	xim->data=(char *)calloc(1, xim->bytes_per_line*xim->height);
-	x11.XFillRectangle(dpy, win, gc, 0, 0, width, height);
 }
 
 /* Swiped from FreeBSD libc */
@@ -1404,9 +1402,10 @@ static void handle_resize_event(int width, int height, bool map)
 
 static void expose_rect(int x, int y, int width, int height)
 {
-	int sx,sy,ex,ey;
 	int xoff=0, yoff=0;
-	int w, h, s;
+	int w, h;
+	int sw, sh;
+	double s;
 
 	if (xim == NULL) {
 		fprintf(stderr, "Exposing NULL xim!\n");
@@ -1416,57 +1415,26 @@ static void expose_rect(int x, int y, int width, int height)
 	w = vstat.winwidth;
 	h = vstat.winheight;
 	s = vstat.scaling;
+	bitmap_get_scaled_win_size(s, &sw, &sh, 0, 0);
 	pthread_mutex_unlock(&vstatlock);
-	xoff = (w - xim->width) / 2;
+	xoff = (w - sw) / 2;
 	if (xoff < 0)
 		xoff = 0;
-	yoff = (h - xim->height) / 2;
+	yoff = (h - sh) / 2;
 	if (yoff < 0)
 		yoff = 0;
 
-	if (xoff > 0 || yoff > 0) {
-		if (x < xoff || y < yoff || x + width > xoff + xim->width || y + height > yoff + xim->height) {
 	x11.XFillRectangle(dpy, win, gc, 0, 0, w, yoff);
-			x11.XFillRectangle(dpy, win, gc, 0, yoff, xoff, yoff + xim->height);
-			x11.XFillRectangle(dpy, win, gc, xoff+xim->width, yoff, w, yoff + xim->height);
-			x11.XFillRectangle(dpy, win, gc, 0, yoff + xim->height, w, h);
-		}
-	}
-
-	sx = (x - xoff) / s;
-	sy = (y - yoff) / s;
-	if (sx < 0)
-		sx = 0;
-	if (sy < 0)
-		sy = 0;
-
-	ex=(x-xoff)+width-1;
-	ey=(y-yoff)+height-1;
-	if (ex < 0)
-		ex = 0;
-	if (ey < 0)
-		ey = 0;
-	if ((ex + 1) % s) {
-		ex += s - (ex % s);
-	}
-	if ((ey + 1) % s) {
-		ey += s - (ey % s);
-	}
-	ex = ex / s;
-	ey = ey / s;
+	x11.XFillRectangle(dpy, win, gc, 0, yoff, xoff, yoff + sh);
+	x11.XFillRectangle(dpy, win, gc, xoff + sw, yoff, w, yoff + sh);
+	x11.XFillRectangle(dpy, win, gc, 0, yoff + sh, w, h);
 
 	/* Since we're exposing, we *have* to redraw */
 	if (last) {
 		release_buffer(last);
 		last = NULL;
-		bitmap_drv_request_some_pixels(sx, sy, ex-sx+1, ey-sy+1);
-	}
-	else {
-		// Do nothing...
-		if (sx == ex || sy == ey)
-			return;
-		bitmap_drv_request_some_pixels(sx, sy, ex-sx+1, ey-sy+1);
 	}
+	bitmap_drv_request_pixels();
 }
 
 static bool