title: The "map.getBounds()" result changed after focused input form in leaflet.js
body: <p>I developing a map Android application based on Phonegap with leafletjs and jQueryMobile.
  This application has two pages. The 1st page is a Mapview, and 2nd page is preferences consisting of some input forms.</p>
  
  <p>When I focus input form (just only!) in 2nd page and transit to 1st page,  map bounds changed for some reason.</p>
  
  <p>EG.
  Before change. The southWest is distinct form northEast.</p>
  
  <pre><code>L.map.getBounds().toBBoxString();  // 135.42702913284302,34.68926290260606,135.42702913284302,34.68926290260606
  </code></pre>
  
  <p>After focused input form. The southWest is identical with northEast!</p>
  
  <pre><code>L.map.getBounds().toBBoxString();  // 135.42702913284302,34.68926290260606,135.4544949531555,34.70252981597828
  </code></pre>
  
  <p>Anyone else have the same problem?
  I could not find a method to set bounds for map.</p>