Nyall Dawson fbd243be65 [processing] Port map layer selection combobox widget to c++
And:

- fix enable state of selected features only after changing between
map layers with/without selections
- fix state of selected features only when running an algorithm
from the history list, e.g. respect original setting for
selected features only (or not)
- ensure no duplicate changed signals are sent, and correctly
emit changed signals in all applicable circumstances
- handle drag and dropped layers from browser panel (UX fix)
- soak with unit tests
2019-06-15 15:05:48 +10:00
..