Atto: Selecting text from right to left when setting styles sets wrong text

I assume the correct way to set text as headings is to place the cursor on the text and choose the style, however, we have users that highlight the entire text by placing the cursor at the end of the text and then selecting backwards to the start and then selecting the style. When we do this often alternative text is being set to the chosen style.

We have this issue in our 2.71 moodle, but I have also tested it on http://qa.moodle.net and http://school.demo.moodle.net. I am using Chrome 37.

How to test:

• Edit any page or anywhere else that uses the atto editor.
• Enter some simple lines of text. I used:
  Heading 1
  Heading 2
  Heading 3
  Heading 4
  paragraph

• Select a line of text (e.g. "Heading 1") by selecting from right to left move all the way out of editor on left side before releasing mouse button
• Set heading to Heading style 1.
• Repeat with other lines with other styles *problem also affect bold, italic, links, images...."

Expected: Text selected becomes the chosen style
Actual: Sometimes the text changed appears to be randomly chose, but presume it is not. selection reverts to previously saved value