automatically merged revision 1094434:
InlineBox::deleteLine shouldn't try to remove() the line box before
disposing of it.

This causes crashes in release mode because remove() will call to a
possibly invalid parent (this parent-is-invalid circumstance isn't fully
clear to me, though), the link to which is only nulled out in
Debug mode.

Let's play this low risk : align Release on Debug for branch backport...

BUG: 193717