If there are more than one transforms added to the list of transforms in the Glyphs Transformer, and we hit the red X button on the right, then it totally zaps all the transforms which we have added. This is totally unexpected behaviour. Normally if we have a delete button to the right of a list of items it deletes each selected item. Deleting all items by default seriously impairs the usability because if we are having a list of transforms, we are not able to remove each individual transform and one mistakenly added transform means you have to do it all over again. The proper behaviour would be to delete only the selected item in the list.
If a person actually totally wants to dump the set of transforms they have decided to apply, then can just hit cancel and reopen the Glyph Transformer all over.
Ideally though, the list box should be multi-selectable and the selected item_s_ should be deleted by hitting the red X. This way, to delete all items we can (hopefully) just do Ctrl+A and hit the Del button on the keyboard (or red X button on screen).