By default only show System Trust discrepancies

[jw3]

A thought on reducing startup time is to default the display of System trust to only show discrepancies. An additional action would be required to include trusted files in the display.

1. Trusted files are less interesting
2. The mass of trusted files is usually where latency comes from
3. We dont have an "Untrust" action, so there is nothing you can do with a trusted file anyways

An additional action to show trusted could be

1. "Show all" check box
2. Use of the search field

This is targeting the latency in the table model and view only, the backend would still generate all metadata.

[egbicker]

I think updating the treeview to show hidden trusted files from the search bar will make more sense to implement once #738 is merged and we can use the Enter key to load that specific entry if it exists.

@jw3 On the call Thursday you made it seem like there was maybe more to this issue. I have only the discrepancies showing on startup with a toggle button in the action toolbar that is wired up and seems to be working.

[jw3]

One thing was that if there are no discrepancies the table will be empty, which may be confusing as to what is going on.

In the case of the empty table it would be nice to display a concise message that informs user that there are no discrepancies and that they can search to display trusted entries.

In the case of 1 or more discrepancies no message is needed.

This is not a popup dialog, its something that overlays cleanly on the table itself. Like an overlay component that places a label on top of the table.

[jw3]

If the overlay is reusable then it can be used for similar purpose on ancillary trust view to let user know to add trust entries.