Appending, expanding a tree node can duplicate its children

[DaniilVeriga]

http://forums.ext.net/showthread.php?24378
http://www.sencha.com/forum/showthread.php?259675
http://www.sencha.com/forum/showthread.php?255689

A temp fix in commit 5021.

EDIT

The temp fix doesn't cover all the cases.
http://forums.ext.net/showthread.php?25664

If expand nodes in a TreeStore's load listener, the issue appears, i.e. the nodes get duplicated. Adding a small delay for a load listener helps. So, added "delay: 100" for a TreeStore's listener in the searching functionality of Examples Explorers.

[fabriciomurta]

Update: Issue still open after ExtJS 6.0.2 release.

[fabriciomurta]

Update: Issue is allegedly irreproducible by the time ExtJS 6.5.0 was released.

[fabriciomurta]

Update: Issue is allegedly irreproducible by the time ExtJS 6.5.1 was released. Sencha allegation: unable to reproduce the issue.

[fabriciomurta]

Update: Issue is allegedly irreproducible by the time ExtJS 6.5.2 was released. Sencha allegation: unable to reproduce the issue.

[fabriciomurta]

Update: Issue is allegedly irreproducible by the time ExtJS 6.5.3 was released. Sencha allegation: unable to reproduce the issue.

[fabriciomurta]

Update: Issue is allegedly irreproducible by the time ExtJS 6.6.0.258 was released. Sencha allegation: unable to reproduce the issue.

[fabriciomurta]

Update: Issue is allegedly irreproducible by the time ExtJS 6.7.0.161 was released. Sencha allegation: unable to reproduce the issue.