I love this extension, but it suffers from a bug that many editor-selection based extensions suffer from, related to the line ending that may be included at the end of the selection.
In the following example, I've very carefully omitted the trailing line ending.
Then I execute the Trim Copy -> no indent command:
This produces the desired result:
But if I do things in a more natural way, by just selecting whole lines:
Notice the very subtle selection difference where the trailing line ending is included.
Now when I paste this into Notepad, not only is the indentation not removed, an extra line has been pasted at the end: