Avoid jumping of items toward right/botton when dropping

Reviewers: #plasma, hein, mwolff

Reviewed By: mwolff

Differential Revision: https://phabricator.kde.org/D8922

containments/desktop/package/contents/ui/FolderView.qml

@@ -1100,6 +1100,11 @@ Item {
                 var from = -1;
                 var to = -1;
 
+                // round the drop pos to half of an item's size to have a more exact
+                // placement in the grid and avoid jumping items
+                dropPos.x = Math.floor((2 * dropPos.x) / cellWidth) * (cellWidth / 2);
+                dropPos.y = Math.floor((2 * dropPos.y) / cellHeight) * (cellHeight / 2);
+
                 for (var i = 0; i < urls.length; i++) {
                     from = positioner.indexForUrl(urls[i]);
                     to = -1;