Image edit via IE11 is not possible on pages with sections and more content

Summary

While editing page, Image edit property panel will not appear when clicking on images on pages with busier images and text and using Page Layout Sections

Environment

• IE11

Steps to Reproduce

1. Create a new blank page
2. Add Two Column Section and populate with random text
   
3. Add Single Column Section and populate with text and images
4. Add 1-2 more Single Column Sections and populate with random text
5. Save page
6. Open the page in IE11, Edit and try to edit images by clicking on them

Expected Results

Image Edit panel is opened

Actual Results

Image panel will not appear, or will not appear for some images, the more content on the page, the less likely the panel to appear
The page will also flicker when clicking images, as described in CONFSERVER-51548 bug

Notes

• Removing columns will bring edit panel back
• Issues can be temporarily removed:
  1. While in developer mode (shortcut F12) > DOM Explorer
  2. Locate "class="innerCell"" CSS class and remove class value:
     This

     <div class="innerCell" contenteditable="true">
     

     Into this:

     <div class="" contenteditable="true">
     

1. 1. Image editing panel will start appearing, at the same time flickering described in CONFSERVER-51548 will also stop

• A test space export is attached for further testing: IE11_test.xml.zip

Workaround

The issue is not observed on other major supported browsers