Allow downloading new posts only if the running indicator is not running

src/qml/danbooruimageview.qml

@@ -231,7 +231,15 @@ Rectangle {
 
             onAtYEndChanged: {
 
-                if (grid.atYEnd && danbooruModel.rowCount() > 0 && !rootObj.poolMode && infiniteScroll) {
+                // Download only if at end, if there are posts, if
+                // we are not displaying a pool, if the option is set
+                // and if we're not already downloading something
+
+                if (grid.atYEnd && danbooruModel.rowCount() > 0 &&
+                    !rootObj.poolMode &&
+                    infiniteScroll &&
+                    !runningIndicator.running) {
+
                     rootObj.downloadStarted()
                     danbooruService.nextPostPage();
                 }