Vim: Como juntar todas as linhas dentro de tag's

This problem, and solution, was posted in StackOverflow

Vim: Visual Select Mode

 Fonte: StackOverflow

Consider the following common scenarios:
You need to select to the next matching parenthesis.
You could do:

• v% if the cursor is on the starting/ending parenthesis
• vib if the cursor is inside the parenthesis block

You want to select text between quotes:

• vi" for double quotes
• vi' for single quotes

You want to select a curly brace block (very common on C-style languages):

• viB
• vi{

Caso esteja no mei de parênteses chaves ou colchetes basta pressionar % que ele pula automaticamente para o começo e em seguida fica alternando entre começo e vim.