Deleting non-merged remote branch does not require 'force delete' to be checked

In Source Tree Log/History View, expand Remotes/origin branch:

1. Create a new branch TEST, place a unique commit on it.
2. Push to origin.
3. select remote branch TEST that is NOT merged
4. right-click on branch name in the tree view at left, select Delete, then OK.

Expectation: You will be warned that branch is not merged, because the "Force delete" check box is unchecked.
Actual: Branch is deleted and pushed.

Possibly the same as this bug, except that this occurs on Windows: https://jira.atlassian.com/browse/SRCTREE-1999