Cannot copy large activity between solutions

Question

I've been successfully using Visual Studio 2012 to copy/paste workflow activities between workflows in separate solutions. This has worked really great until I ran into an activity which is quite large - 43KB (Clipboard data is 43571 bytes long). I know that activity gets successfully copied because I can paste it in notepad and see that entire XML has been copied. But when I try to paste it in another workflow, "Paste" option in context menu is disabled:

I am trying to avoid a situation where I need to copy activities partially. Does anyone have a suggestion how to workaround this issue?

EDIT: I can successfully copy activity which has clipboard data 36421 bytes long.

Answer 1

In the end I copied XML manually i.e. I opened the target workflow in code view (F7 key in Visual Studio) and I pasted the activity XML directly to workflow.xaml file.

EDIT:
There seems to be another solution to this. If target workflow is empty then drag one WriteToHistory activity to workflow surface and try to copy activities. Apparently dropping WriteToHistory activity (or any activity AFAIK) causes workflow XAML to add necessary dependencies. At the end simply delete WriteToHistory activity.