Got a problem with Grid Data in Custom Operator.
I would like to use GridData Parameter as bridge to pass calculated in
Operator arrays to CustomTool.
But when i try to resize GridData due CustomOperator_Update() callback by
adding this line:
    testGrid.PutColumnCount(1);
My Custom Operator runs current Update callback to the end and doesn't run
it next time when it should.
It's very odd behaviour.

Here is a very simple test plugin:
https://urldefense.proofpoint.com/v2/url?u=https-3A__www.dropbox.com_sh_akq76u1consjmhf_AAD2zF5CxMa-2Dyk1Fr6fISOB2a&d=DwIBaQ&c=76Q6Tcqc-t2x0ciWn7KFdCiqt6IQ7a_IF9uzNzd_2pA&r=GmX_32eCLYPFLJ529RohsPjjNVwo9P0jVMsrMw7PFsA&m=6zwZtGA11dufxwJ7KJDyyWiRtRNGSxkt6rZoz5lD9xs&s=WeKBNg2HcBE_tL4j0XEn2yys-nvtZf8WIQNCO9u0H2M&e=
MyTest.7z is archive with compiled dll file.
Select on one object some edges. And apply myTestStart command from this
small plugin.
Then drag mmb and you would see that Tool::MousDrag callback and
Operator::Update callback both print out offset value.
But if in function PopulateGrid() you uncomment line
"testGrid.PutColumnCount(1);" you would see that Operator stop print out
offset.
It also stop Operator::Update callback loop.

How should i use GridData in Custom Operator ?
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