File uploader appears on top of the content body when adding a new KB article via Add Content in sidebar

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.0.0 DXP SP1, Master
• Fix Version/s: 7.0.X EE, 7.1.X, Master
• Component/s: Knowledge Base widget, ~ [Archived] Collaboration
• Labels:
  • front-end
• Branch Version/s:
  7.0.x
• Backported to Branch:
  Committed
• Fix Priority: 3
• Sprint: Padparadschah 10/25-11/8
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/44320

Steps to reproduce

1. Go to Add > Content > Add New > Knowledge Base Article
2. Expand the attachments panel

Expected result: File uploader opens under the Attachments panel and not covering the content field
Actual result: File uploader displays on top of the content body, making the content field not clickable. Attachments panel cannot be collapsed bacause it is also under the file uploader. Please see attached gif.

Reproduced on:
Tomcat 8.0.32 + MySQL 5.6
Portal master GIT ID: 355a534fb71403a9413e9c505b22bced7a5190ca
Portal ee-7.0.x GIT ID: 041016c98706342f9bc8e5bc36c882d17ae8900b