When editing in projucer, if I have an element which is positioned relative to the left margin and I copy/paste it, the pasted version occurs in the code but is generally not visible as it is placed well beyond the bounds of the component I am working on. Trying to graphically edit is not possible as it is outside the bounds of the component. Editing the code leads to other subcomponents moving around too. In short - it can lead to chaos requiring starting the edit again from scratch.
Workaround appears to be not doing copy/paste unless the component you are copy/pasting is relative to top-left of parent component.