title: local flutter asset image not showing in html widget
body: <p>I am using flutter_html to render html code and it is working well but I am having a problem with img tag</p>
  
  <p>The img tag work well when the image is from the web like this:</p>
  
  <pre><code>&lt;img src="https://www.google.com/images/branding/googlelogo/1x/googlelogo_color_272x92dp.png"&gt;
  </code></pre>
  
  <p>but it doesn't work when it's a local asset image file
  Note: I can use the same image in an Image widget like this:</p>
  
  <pre><code>Image.asset('assets/images/logo_tst.png'),
  </code></pre>
  
  <p>but it wont show in html code and I tried all these:</p>
  
  <pre><code>String htmlUrl = '''  
  &lt;img src="file:///storage/assets/images/logo_tst.png" alt="web-img1" &gt;
  &lt;img src="file:///assets/images/logo_tst.png" alt="web-img2"&gt;
  &lt;img src="file:///images/logo_tst.png" alt="web-img3"&gt;
  ''';
  </code></pre>
  
  <p>then I call it:</p>
  
  <pre><code>Html( data:htmlUrl),
  </code></pre>
  
  <p>And it only shows the alt:</p>
  
  <pre><code>web-img1
  web-img2
  web-img3
  </code></pre>
  
  <p>I am testing on an Android emulator and a device</p>
  
  <p>what Am I doing wrong?</p>
  
  <p>Thank you</p>