Inconsistent behaviour when using the Ctrl-H (Highlight Current Statement) functionality in the E (4240705)

When using the Ctrl-H (Highlight Current Statement) functionality in the Editor, there is inconsistent behaviour in how it's intended to work.
Instead of highlighting the whole line, it highlights the last section of code that is typed.

Example:
1. Open a new Editor window
2. Type 'SELECT * FROM dual WHERE 1 = 1'
3. Press Ctrl-H
4. Replace last '1' with '( SELECT 1 FROM dual )' (type in manually, not cut-and-paste)
5. Press Ctrl-H

For example, when the line looks like:
" select * from dual where 1 = ( Select 1 from dual ) "

if 'dual )' is removed from the last part of the code, then re-typed, when Ctrl-H is pressed it will only highlight 'dual )'.
Rather than highlighting the whole line of code every time, it's just highlighting a section (the last typed/edited piece of the code).