Merge pull request #18772 from eileenmcnaughton/ids

dev/core#2066 Extract getSelectedIDs

diff --cc CRM/Campaign/Form/Task.php
Simple merge

diff --cc CRM/Core/Form/Task.php
Simple merge

diff --cc CRM/Event/Form/Task.php
Simple merge

diff --cc CRM/Grant/Form/Task.php
Simple merge

diff --cc CRM/Member/Form/Task.php
Simple merge

diff --cc CRM/Pledge/Form/Task.php
Simple merge