Fixes #149 and #163

[SerheyDolgushev]

Question	Answer
JIRA issue	N/A
Bug/Improvement	yes
New feature	no
Target version	2.1
BC breaks	no
Tests pass	yes
Doc needed	no

With this PR I want to clean up the mess created in #148. Per my understanding, the following happened:

1. EZP-31632: Floating table toolbar #148 and EZP-31641: Unable to manage links in table cells #149 were submitted at the same time.
2. EZP-31641: Unable to manage links in table cells #149 was based on 2.0 and it was QAed and merged almost right after submission.
3. EZP-31632: Floating table toolbar #148 was based on master and it wasn't updated for a few months.
4. A few months later I was asked to sync the latest master changes in EZP-31632: Floating table toolbar #148. And some of those changes caused an issue that was related to previously merged and QAed EZP-31641: Unable to manage links in table cells #149.
5. Instead of submitting a new PR I put 30c2ac0 as part of EZP-31632: Floating table toolbar #148.
6. EZP-31933: Fixed custom tag link edit #163 was recently submitted, QAed and merged. And be4fb0a has some fixes related to EZP-31933: Fixed custom tag link edit #163. be4fb0a was also pushed to EZP-31632: Floating table toolbar #148.
7. Just to make things more simple and clean, be4fb0a and be4fb0a were reverted in EZP-31632: Floating table toolbar #148. And those two commits were added as this PR.

@dew326 @lserwatka

Please note, this PR has nothing common to #148. But without this PR issue mentioned in #149 still persist. So it would be very nice to get this PR merged in the next release. While #148 can wait.

TODO:

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

[lserwatka]

@dew326 could you merge it up? I need this for 3.1.3 release.

[dew326]

Merged to master