[QGIS-Developer] icons for remove/delete actions

[Raymond Nijssen]

Many icons in QGIS have little shields specifying what kind of action 
they represents, like adding, editing and removing. For removing and 
deleting things, I found 3 different shields though, a cross, a traffic 
sign and a minus.

What is the logic for these 3? A difference in removing or deleting or 
hiding maybe?
Or is this just caused by QGIS's evolution? In that case, what should be 
the right shield to use now?

See attached screenshot

Thanks!
Raymond

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