Indent plugin outdent doesn't work all the way using decimal ems

[Nick DeSteffen]

Steps to reproduce

1. Configure IndentOffset and indentUnit:

  CKEDITOR.config.indentOffset = 1.618;  
  CKEDITOR.config.indentUnit = 'em';

2. Indent some text
3. Outdent same text

Expected result

The element should not have the style attribute with the value "margin-left: 1.618em;"

Actual result

The element does have the style attribute with the value "margin-left: 1.618em;"

Other details (browser, OS, CKEditor version, installed plugins)

Chrome 48.0.2564.103 (64-bit) OSX 10.10.5

[Jakub Ś]

Problem can be reproduced at least from CKEditor 4.0.

There will always be one indentation step of leftovers - "margin-left: 1.618em;