Partitioned Tables Lose Time Formatting

[dgodinez-dh]

This was seen in Enterprise ticket https://deephaven.atlassian.net/browse/DH-17730
I reproduced the issue in:

• Enterprise Grizzly (1.20240517.246), Web Core+ (v0.85.4)
• Enterprise San Luis (1.20240723.052beta)
• Latest Web Core+ (v0.95.0)

Because the Enterprise ticket is for Grizzly, the majority of my testing and investigation is for that version (Web Core+ v0.85.4).

To Reproduce

• In Settings, change Time Zone to Sydney (or anything not New York)
• turn on time zone to display
• run the following script:

from deephaven import empty_table
from deephaven.time import dh_now

source = empty_table(5).update(["IntCol = i", "StrCol = `value`", "Timestamp = dh_now()"])
partitioned_table = source.partition_by(["Timestamp"])

• Note that the source table formats time zone correctly but partitioned__table does not.
• Change TZ in settings to fix the issue.
• Switch table tabs to source then back to partitioned_table to see it re-occur
• Do a rollup on source and see that rollups cause the issue
• Do a select distinct on source and see that it causes the issue

Investigation

I found that IrisGridProxyModel was creating an IrisGridTableModel with an undefined formatter.
I noticed several places in IrisGridProxyModel we use this.formatter. I believe it should be this.originalModel.formatter