vim: delete all blank space until next non-blank character

Question

Say I have the following code:

    Hello

And I want to make it

Hello

Answer 1

There's a tag text-object in vim:

• put cursor within tag, press vat to select entire tag
• press :, it becomes :'<,'>
• type j, it becomes :'<,'>j
• press Enter to join lines

---

:help v_at

at          "a tag block", select [count] tag blocks, from the
            [count]'th unmatched "" backwards to the matching
            "", including the "" and "".
            See |tag-blocks| about the details.
            When used in Visual mode it is made characterwise.