Storing ID to edit/delete in the session can lead to wrong item affected

When deleting items the ID to delete is stored in the session. This can lead to the wrong item being deleted, when other items are opened in additional tabs.

The same issue emerges when editing some items - information is changed on the wrong one.

I've confirmed the 'delete' issue on dmaster for events, groups, tags, price sets...

I've confirmed the 'edit' issue on dmaster for tags

Steps to recreate the 'delete' error, using tag as an example:

Add a tag 'Tag A'
Add a tag 'Tag Z'

Open the link to 'Delete' Tag A in a new tab/window
Open the link to 'Delete' Tag Z in a new tab/window

Confirm deletion of Tag A
Notice that Tag Z has actually been deleted

Steps to recreate the 'edit' error, using tags as an example:

Add a tag 'Tag A'
Add a tag 'Tag Z'

Open the link to 'Edit' Tag A in a new tab/window
Open the link to 'Edit' Tag Z in a new tab/window

Rename 'Tag A' to 'Tag Foo', save and done
Notice that Tag Z has actually been renamed

Related issues
CRM-15288