Platform
Perspective on Ignition 8.0.12
Ubuntu 18.04
Firefox 76 and Chrome 80
What I did
I created a perspective table, made one of the columns sortable, and set the selection mode to “multiple interval”. When in a perspective session I click on the sortable column header to sort the data. Then I click a row and hold the shift key and click another row.
What I expected
I expected the range of visible rows between my two clicks to be selected.
What actually happened
I got what seemed to be a random set of selected columns. After further investigation, I noticed the rows selected weren’t random, but instead were the range formed as if I had clicked those two rows when the data had not been sorted.
Example
Below is a screenshot of me doing this. I used the perspective table default data, made the city column sortable, set the selection mode to multiple interval. Then in a browser I clicked city to sort it ascending. Then I clicked on the row with “Abidjan” then shift-clicked the row with “Bandung”.
You can see "Berlin, “Chicago” and “Dar es Salaam” are highlighted, which I wouldn’t expect when selecting a range between the top two rows.
Additional information
If I click the city header twice more to remove the sort on the column, then I can see that the selected rows form a single range based on the original order of the data. So I know the selection isn’t random, it’s based on the data’s original order. Unfortunately that isn’t helpful because I want to select a range based on the sort that I applied, not the data’s original order.
I noticed the same problem happens when sorting on any column. It also happens when the selection mode is “single interval”.