Witouth this we can get into issues where only the picker is visible
and the rest of the GUI is completely grey when selecting a date
with the date picker, generally this happens when a scroll field is
involved (e.g., syslog).
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
in extjs 5/6 there is a caching issue, where they
save dom elements for reuse, but the garbage collector
can set them to null
when the framework now reuses the "cached" element it is null,
and any action on it produces an error, which breaks the site
for details see the forum link in the comment
Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
