Martin Dobias ea1716261a Make sure that also groups with "required" layers cannot be removed
Fixes an unreported bug where it was possible to select a layer tree group
and remove even when it contained required layers.

When removing layers/groups, the following checks will now also recursively
test layers and not just directly selected layers:
- test for layers with unsaved changes
- test for layers with active tasks running in background
2018-09-26 09:55:37 +02:00
..
Dox
2018-09-26 04:27:08 +10:00
2017-07-24 11:36:38 +02:00
2017-10-29 10:46:54 -05:00
2018-02-18 20:53:40 +01:00
2018-05-31 12:33:38 -08:00
2018-09-19 20:13:29 -04:00
2018-09-10 15:25:42 +10:00
2018-09-06 05:56:09 +10:00