Link to Eclipse Bugzilla Bug:https://bugs.eclipse.org/bugs/show_bug.cgi?id=57580
In short, it has been suggested that the Watch Expressions should at least include a code completion feature, instead of typing the codes out again.
As far as I know, Eclipse allows code completion when you're adding codes to set conditional breakpoints, so I do know the benefits of having code completion outside of normal uses (editing codes in the text editor of Eclipse, etc.).
This has been reported for quite a while, and nobody has since brought it up. Do you suppose that this "feature" should be implemented in future Eclipse versions?