I have done this too many times as well, and I wonder if this tool:... the "create new sketch" icon on the tool bar, opens the existing sketch if you have one selected in the treeview. I just find it annoying, I have many times accidentally opened a sketch when I wanted a new one. If I wanted to edit a sketch I would do so via the item in treeview ...
should just be "Create a New Sketch" and not also serve to edit an existing Sketch. (But to be fair the tooltip does read: "Create a new or edit the selected sketch".)
When I want to edit a Sketch I could right-click it in the tree view and "Edit Sketch" in the pop-up window is right next to the cursor, but I usually just double-click it in the tree view. I think opening an existing Sketch is easy enough and the "edit sketch" portion of the tool button is more of a hindrance and would like to know what others think about this.
This reminded me of something else but I'll start a new thread for that topic.