[Qgis-developer] Quick fixes and error communication for ftools

[Anita Graser]

Hi,

If you are following the psc list, you've probably seen the thread
discussing current shortcomings of ftools (
http://lists.osgeo.org/pipermail/qgis-psc/2015-November/003623.html)

In short, the key issues are:
1. When ftools encounter issues with certain features, warning messages get
written to the log but this is largely hidden from users since they would
actively have to actively monitor the log. The problematic features are
then missing from the results but this is not always obvious.
2. The above issue is more common now (since 2.10) since underlying
libraries more often (and correctly so) produce geometry collections as
outputs. These geometry collections are not handled well by the current
ftools code which is much older.

To address these issues, the following suggestions have been made so far:
ad issue 1: update fTools to warn users when some features cause problems
ad issue 2: quick fix fTools to convert geometry collections to single
geometry types

For the warnings, there's already a first PR draft
https://github.com/qgis/QGIS/pull/2432 which needs to be fleshed out.

These fixes/updates would be made available as fTools updates via the
plugin installer asap.

If you have ideas how to handle this efficiently or have already
implemented code that addresses similar issues, let us know.

It would be good to have a quick discussion in order to be able to provide
improvements fast.

Best wishes,
Anita
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