STR:

• On clean install, edit any content with richtext field
• Click "+" (Add) button on the left
• Select "Facebook" tag (or any other)
• Fill attributes and save
• On the top bar, click "pencil" (edit) icon to edit custom tag attributes
• Click "Cancel"

AR: Richtext fields editing unresponsive, error in console - "Cannot read property 'isAligned' of null"

ER: Attributes editing closed, and top bar displayed. The same as after "Save" button click.

PR: https://github.com/ezsystems/ezplatform-richtext/pull/169