In ExtJs 4 all columns in a Ext.grid.Panel were automatically resizable. After upgrading to ExtJs 6.2, it is no longer possible to resize te column. The cursor will still change to resize, but resizing no longer works.
I looked into the documentation of Column.resizable, and it seams that resizable: true is still the default.
Why then is it, that resizing no longer works?
Edit: I observe the same behavior with the splitters of border layout: the cursor changes to resize, but I'm not able to drag the splitter.
The issue was that I reaffected document.id = ...
There is not much chance someone else will have the same problem, but still, this is the answer.