default extensions behavior

• handleSwap: new content is handled by htmx10ms ‣

  this.server.respondWith('GET', '/test', '<button id="test-ext-testswap">Clicked!<span hx-get="/test-inner" hx-trigger="load"></span></button>')
  this.server.respondWith('GET', '/test-inner', 'Loaded!')
  make('<div hx-ext="ext-testswap"><button hx-get="/test" hx-swap="testswap">Click Me!</button></div>').querySelector('button').click()
  this.server.respond() // call /test via button trigger=click
  var btn = byId('test-ext-testswap')
  btn.textContent.should.equal('Clicked!')
  loadCalls.length.should.equal(1)
  loadCalls[0].textContent.should.equal('Clicked!') // the new button is loaded
  this.server.respond() // call /test-inner via span trigger=load
  btn.textContent.should.equal('Clicked!Loaded!')
  loadCalls.length.should.equal(1) // text should not trigger event