HTML handler: Reformat passing viewport height when triggered by object.

Previously we correctly used the viewport width, but we were using the
document height instead of viewport height when an HTML child content
triggered a reformat of the parent HTML document.

content/handlers/html/html_object.c

@@ -166,7 +166,7 @@ html_object_callback(hlcache_handle *object,
 					c->base.status == CONTENT_STATUS_DONE)
 				content__reformat(&c->base, false,
 						c->base.available_width,
-						c->base.height);
+						c->base.available_height);
 		}
 		break;
 
@@ -459,7 +459,7 @@ html_object_callback(hlcache_handle *object,
 	     event->type == CONTENT_MSG_ERRORCODE)) {
 		/* all objects have arrived */
 		content__reformat(&c->base, false, c->base.available_width,
-				c->base.height);
+				c->base.available_height);
 		content_set_done(&c->base);
 	} else if (nsoption_bool(incremental_reflow) &&
 		   event->type == CONTENT_MSG_DONE &&
@@ -484,7 +484,7 @@ html_object_callback(hlcache_handle *object,
 			content__reformat(&c->base,
 					  false,
 					  c->base.available_width,
-					  c->base.height);
+					  c->base.available_height);
 		}
 	}