Follow instructions from UI help guide - Using the new QuickEdit feature in the Eclipse UI 18.1.7
Step 7. Edit the contents of the element.
Step 8. Right-click on the source that is open in the editor and select "Add to Endevor.”
Issue: The original unedited source is added to Endevor if souce is not saved first (should prompt user to save the change before "Add to Endevor" step).
Release : 18.1
Component : ENDEVOR ECLIPSE PLUGIN 18.1.7
The Eclipse UI plugin published after 18.1.7 will prompt user to save the element change before adding it to Endevor.