Buttons state doesn't refresh properly on iOS

[jswiderski]

Type of report

Bug

Provide detailed reproduction steps (if any)

NOTE: Bug report will require further testing in order to exclude possibility that this is an upstream issue and that Safari returns selection incorrectly.

1. Enter any text inside the editor and select it.
2. Click on link button to make the selected text a link.
3. Enter some more text.
4. Try putting the cursor inside the link and plain text (play around a bit by changing the selection)

Expected result

Unlink button activates when selection is inside the link and deactivates when it is inside plain text.

Actual result

Unlink button state doesn't refresh properly. Sometimes Unlink button stays activated with selection inside plain text and sometimes it doesn't get activated when selection is inside the link.

Other details

• Browser: Safari
• OS: iOS 11.3.1
• CKEditor version: 4.10.0
• Installed CKEditor plugins: Link

[jacekbogdanski]

Closed by #2297.