Shift + End Selection on IE Selected The Whole Line Instead of Only The Characters

Steps to Reproduce:

1. Create or edit a page
2. Write two lines of text in it
3. Position cursor on your first line
4. Select the first line using "Shift" + "End"
5. Try to delete, cut or start typing text to replace
6. Editor will deleted the whole line instead of just the characters selected

Expected Results:

This issue is not reproducible using Chrome and Confluence successfully write only the characters inputted by the user after selecting the character using "Shift" + "End".

Actual Results:

Editor deleted the whole line and the second line will moved up.

Environment Information (In the Environment Field):

Internet Explorer 9 and 10