[Qgis-developer] Possible bug with select in a rectangle

[Zoltan Szecsei]

Hi Guys,
I tried to go to QGIS issue tracking, but was told that the "site was 
under heavy load", so haven't checked if this is a known issue.

Platform is Ubuntu 14.10 with self-compiled QGIS 1614ac8.

Scenario:
I have a shape file with some 700K points, and a raster image covering 
about 10 of these points.
I want to delete all except these 10 points.

Try #1

    I select my 10 points, open the attribute table and click invert
    selection.
    I then click the red bin (delete selected) and wait (I left it going
    overnight)
    The next morning I killed the task and when I re-opened the point
    file, my 10 points were deleted and the rest were still there.
    Clue: I might have clicked delete selected before the 'invert
    selection' had finished. This would be due to the fact that I may
    not have seen (if any) indication that the invert selection task had
    completed.

Try #2

    I zoom to the extents of the point file, turn off rendering of the
    point file, turn on editing in the point file.
    I then select (invisible) features from this point file in a large
    rectangle above my visible raster image.
    After a few second I get no indication that anything is selected,
    and the 'delete selected' icon remains grey.
    I turn on rendering for the point shape file, and those that were in
    my rectangle are rendered in yellow (ie: 'selected')
    I open the attribute table and the 'delete selected' icon IS red,
    and I can move my selection to the top.
    I then delete the selection from the attribute table as the icon on
    the toolbar is still not 'available'.
    After 10 minutes or more, I get tired of waiting and kill the job.

Try #3

    I re-open the point file, leave rendering on, select the same points
    as in try #2 above, and click 'delete selected'.
    After 2-3 minutes or so, the selected points are deleted as expected.

So, I've raised a few issues here, but they seem to be centred on the 
attribute table being open.

Regards,
Zoltan


-- 

===========================================
Zoltan Szecsei PrGISc [PGP0031]
Geograph (Pty) Ltd.
GIS and Photogrammetric Services

P.O. Box 7, Muizenberg 7950, South Africa.

Mobile: +27-83-6004028
Fax:    +27-86-6115323     www.geograph.co.za
===========================================

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