[IMPROVEMENT] Allow selecting multiple rows in main grid.

[jafin]

Please confirm these before moving forward.

• I have searched for my feature proposal and have not found a work-in-progress/duplicate/resolved/discarded issue.
• This improvement refers to an existing feature. If you want to suggest a new feature, please use this template.
• This improvement is not a bug. If you want to report a bug, please use this template.

Describe the improvement

Existing

The main grid allows a user to select a row, click and make selected.
There is no mechanism to multi select (typically click a row, shift click another group to select the between group.

Improvement

Provide the ability to select a group of rows using CTRL-Click or SHIFT-Click to group a collection of rows.

Describe how this improvement could help users

More flexibility selecting packages/updates

[marticliment]

You already have checkboxes for that

[jafin]

This was just a convenience request, i.e. Shift-Select a group of 10 options. vs having to click 10 boxes individually.
I don't appear to be able to SHIFT-select a group of checkboxes.