ExtendedMarkersView doesn't consider ViewerFilter when using Limit

[eobrienPilz]

If there is a ViewerFilter applied to the ExtendedMarkersView MarkersTreeViewer then the limit on the ExtendedMarkersView doesn't work as you would expect. The limit is applied to all of the markers before the viewer filter is applied. As a result it means markers can go missing from the Marker support view.

see the screenshot.

This shows a view that only displays red markers (using a viewer filter). A workspace with 4 red and 4 blue markers and a marker limit set to 5. Only 1 red markers makes it into the view as the limit removes the others.

2 failing tests showing the above case: #346

[jukzi]

@eobrienPilz Tests look good. can you provide a fix?

[eobrienPilz]

I don't have a fix off hand. I am going to wait until some of my outstanding merge requests get landed before investigating more.

[mickaelistria]

FWIW, bugfix patches usually get merged much faster than feature/API changes.