#2872 Bug sequence where undo of zoom on events list changes the dataset

[Jeremy Faden]

Ivar showed me an impossible bug where undoing an operation appears to change the dataset loaded.

1. plot Ivar's events in a vap file
2. note in metadata tab that it loads properly in the canonical events scheme, note the color
3. zoom in
4. undo to return to the initial state.

The data now appears to have grey bars and the cadence is guessed, rendering incorrectly. Looking at the metadata tab you can see that the data has been modified.

[Jeremy Faden]

I awarded Ivar the bug of the week.

[Jeremy Faden]

See (on UIowa campus) /home/jbf/project/tracers/research-git/tracers/u/ivar/2026/20260724

[Jeremy Faden]

This seems to be a bug in the CSV reader, where it actually returns a different dataset:

invoke later do load
loading dataset vap+csv:file:///home/jbf/project/tracers/research-git/tracers/u/ivar/2026/20260724/ts1_att-coverage_2026-07-22.csv
load vap+csv:file:///home/jbf/project/tracers/research-git/tracers/u/ivar/2026/20260724/ts1_att-coverage_2026-07-22.csv
read dataset: dataset[1612,BUNDLE_1=4] from vap+csv:file:///home/jbf/project/tracers/research-git/tracers/u/ivar/2026/20260724/ts1_att-coverage_2026-07-22.csv
dep names: [dim0, dim1]
do statistics on the data
done with statistics on the data (1ms)
enter updateFill
request update vap+csv:file:///home/jbf/project/tracers/research-git/tracers/u/ivar/2026/20260724/ts1_att-coverage_2026-07-22.csv
invoke later do load
loading dataset vap+csv:file:///home/jbf/project/tracers/research-git/tracers/u/ivar/2026/20260724/ts1_att-coverage_2026-07-22.csv
load vap+csv:file:///home/jbf/project/tracers/research-git/tracers/u/ivar/2026/20260724/ts1_att-coverage_2026-07-22.csv
The following exception occurred while parsing: For input string: "0x6600bb00"
read dataset: att_cvg_00000[field0=1612] (enum(ordinal)) from vap+csv:file:///home/jbf/project/tracers/research-git/tracers/u/ivar/2026/20260724/ts1_att-coverage_2026-07-22.csv
dep names: [field0]
do statistics on the data in the background
enter updateFill
done with statistics on the data (1ms)

[Jeremy Faden]

Within AsciiTableDataSource, In the first working case, the variable "eventListColumn" is set to "field3" and the non-working case it is not set.

[Jeremy Faden]

The AsciiTableDataSource now explicitly resets class variables "column" and "bundle" when getDataSet is called.