As stated in #809, I think being able to explicitly select multiple blocks would be useful for ease of use, as well as clarity in what exactly will be affected by context menu items.
- Selections are made by clicking on uncovered parts of the edit area, and dragging to include blocks.
- If you drag over multiple groups of blocks, this will create multiple selections.
- Mouse-based interactions, if done on a selected block, will also apply to all *attached* blocks in the same selection.
- This includes dragging, shift-dragging, alt-dragging, and right-click context actions
- Some menu items ("view help" and "find in ...") will only be applicable if a single block is selected.
- All actions, if done on a single block, will now apply ONLY to that single block, and any children if the block is a wrapper.