fix: dragging fails for collapsed blocks with Icons, which have been … (

google#6081)

* fix: 6076 "dragging fails" improved

* fix: "dragging fails (bug google#6076)" tested version

* fix: "dragging fails (bug google#6076)" moved fix-code after L625

core/serialization/blocks.js

@@ -623,6 +623,12 @@ const initBlock = function(block, rendered) {
 
     blockSvg.initSvg();
     blockSvg.render(false);
+    // fixes #6076 JSO deserialization doesn't
+    // set .iconXY_ property so here it will be set
+    const icons = block.getIcons();
+    for (let i = 0; i < icons.length; i++) {
+      icons[i].computeIconLocation();
+    }
   } else {
     block.initModel();
   }