This test checks that typing over the decoration does not collect decoration text as a part of damaged DOM.

Chunk model
Chunk [0] 0:10 (expanded)
Editor DOM
[0]       <div class="webkit-line-content"><span>0</span></div>
[1]       <div class="webkit-line-content"><span>1</span></div>
[2]       <div class="webkit-line-content"><span>2</span></div>
[3]       <div class="webkit-line-content"><span>3</span></div>
[4]       <div class="webkit-line-content"><span>4</span></div>
[5:6]     <div class="webkit-line-content"><span>5</span><div class="webkit-line-decorations"><span>Decoration content</span></div></div>
[6]       <div class="webkit-line-content"><span>6</span></div>
[7]       <div class="webkit-line-content"><span>7</span></div>
[8]       <div class="webkit-line-content"><span>8</span></div>
[9]       <div class="webkit-line-content"><span>9</span></div>
Editor DOM
[0]       <div class="webkit-line-content"><span>0</span></div>
[1]       <div class="webkit-line-content"><span>1</span></div>
[2]       <div class="webkit-line-content"><span>2</span></div>
[3]       <div class="webkit-line-content"><span>3</span></div>
[4]       <div class="webkit-line-content"><span>4a5</span></div>
[5]       <div class="webkit-line-content"><span>6</span></div>
[6]       <div class="webkit-line-content"><span>7</span></div>
[7]       <div class="webkit-line-content"><span>8</span></div>
[8]       <div class="webkit-line-content"><span>9</span></div>