Timeline resize CalendarEvent

[Hirn]

In the example below, click the link
https://www.smartclient.com/smartcli...simpleTimeline

1. set the start date for the calendar 19.07.2020
2. try to make a change in the size of the event "New Samples" per drag
3. we see an error in the debugger
Uncaught TypeError: Cannot read property 'startLeftOffset' of null
at _3.dragResizeMove (ISC_Calendar.js?isc_version=v12.1p_2020-04-27.js:72)
at _3.isc_c_EventHandler_bubbleEvent [as bubbleEvent] (ISC_Core.js?isc_version=v12.1p_2020-04-27.js:2436)
at _3.isc_c_EventHandler_handleEvent [as handleEvent] (ISC_Core.js?isc_version=v12.1p_2020-04-27.js:2139)
at _3.isc_c_EventHandler_handleDragMove [as handleDragMove] (ISC_Core.js?isc_version=v12.1p_2020-04-27.js:2354)
at _3.isc_c_EventHandler___handleMouseMove [as $kz] (ISC_Core.js?isc_version=v12.1p_2020-04-27.js:2223)
at _3.isc_c_EventHandler__handleMouseMove [as $kx] (ISC_Core.js?isc_version=v12.1p_2020-04-27.js:2212)
at _3.isc_c_EventHandler_handleMouseMove [as handleMouseMove] (ISC_Core.js?isc_version=v12.1p_2020-04-27.js:2212)
at _3.isc_c_EventHandler_dispatch [as dispatch] (ISC_Core.js?isc_version=v12.1p_2020-04-27.js:2531)
at HTMLDocument.eval (eval at isc__makeFunction (ISC_Core.js?isc_version=v12.1p_2020-04-27.js:88), <anonymous>:3:123)
dragResizeMove @ ISC_Calendar.js?isc_version=v12.1p_2020-04-27.js:72
isc_c_EventHandler_bubbleEvent @ ISC_Core.js?isc_version=v12.1p_2020-04-27.js:2436
isc_c_EventHandler_handleEvent @ ISC_Core.js?isc_version=v12.1p_2020-04-27.js:2139
isc_c_EventHandler_handleDragMove @ ISC_Core.js?isc_version=v12.1p_2020-04-27.js:2354
isc_c_EventHandler___handleMouseMove @ ISC_Core.js?isc_version=v12.1p_2020-04-27.js:2223
isc_c_EventHandler__handleMouseMove @ ISC_Core.js?isc_version=v12.1p_2020-04-27.js:2212
isc_c_EventHandler_handleMouseMove @ ISC_Core.js?isc_version=v12.1p_2020-04-27.js:2212
isc_c_EventHandler_dispatch @ ISC_Core.js?isc_version=v12.1p_2020-04-27.js:2531
eval @ VM59:3

[Isomorphic]

This has been fixed back to 12.0, for builds dated April 30 and later.