Update-PipeScript should use AST based offsets #439
Description
At various points within Update-PipeScript, things map the position of an AST element within text, based off of a moving offset.
This mostly works but has a really insidious possibility of fubar.
If a comment line contains the exact content of the AST element we're looking for, it will be picked as the insertion point.
This is obviously undesired.
While it might be a tricky rabbit hole to fall into, Update-PipeScript should not allow it to happen.