Since we set double-click as the default click style, selection happens on the first click, so Dolphin doesn't need to show those baffling green plus button selection markers in the corner. We should turn them off.
These should probably automatically show and hide based on the click setting anyway, but that's an upstream change/decision...
If the 'plus' button is not shown again when changing back to 'single-click' mode: -1 for the change because it's bad for everyone switching back to single-click mode.
Agreed: -1 unless the selection marker is automatically added back when switching back to single-click.
All right, we'll handle this upstream: https://bugs.kde.org/show_bug.cgi?id=392788
I notice that Plasma's Folder View already does this, so it should be no great controversy to add the same feature to Dolphin (fingers crossed).
Submitted a patch, so let's see what happens: https://phabricator.kde.org/D11979
If it's accepted, we might consider cherry-picking it.