Ability to get the short hex from CKEDITOR.tools.color instance

[Comandeer]

Type of report

Feature request

Provide description of the new feature

Currently CKEDITOR.tools.color#getHex() does not allow getting short version of hex.

We can introduce shorten parameter that would indicate that the short hex is wanted, e.g.

var color = new CKEDITOR.tools.color( '#000000' );

console.log( color.getHex( true ) ); // '#000'

In case of the non-shortenable hexes, it should return the full hex:

var color = new CKEDITOR.tools.color( '#CDAB65' );

console.log( color.getHex( true ) ); // '#CDAB65'

It should be also introduced for CKEDITOR.tools.color#getHexWithAlpha().

[f1ames]

We had started working on the PR to cover this issue but decided to postpone it due to #4718 (comment).