IBX-962: New custom tag inserting

[SerheyDolgushev]

Question	Answer
JIRA issue	IBX-962
Bug/Improvement	yes
New feature	no
Target Ibexa version	3.3
BC breaks	no
Tests pass	yes
Doc needed	no

Steps to reproduce:

1. Create a new content item with RichText field
2. Try to insert Facebook (or any other) custom tag into the RichText field
3. On the custom tag attributes screen click the "Cancel" link

Expected result
Insert custom tag dialog is closed.

Actual result
Insert custom tag dialog stays on the screen and the following JavaScript error is thrown:

react-dom.production.min.js:32 Uncaught TypeError: Cannot read property 'setFocused' of null at ButtonCustomTagUpdate.cancelCustomTagEdit

TODO:

• Implement feature / fix a bug.
• Implement tests.
• Fix new code according to Coding Standards ($ composer fix-cs).
• Ask for Code Review.

[adamwojs]

CI failure is not related to PR changes

[bogusez]

@SerheyDolgushev unfortunately but fix didn't solve the problem on my local environment. I've tried to apply the fix in both ways (clone repo using your fork and also patching the file).

[bogusez]

It seems like I had some problems with my local environment. After reinstalling local env, fix works fine. Sorry for confusion.

[lserwatka]

@alongosz could you merge it up?

[alongosz]

Merged into master via 2c5df1a.