The delimiters fail with 'Camel Case Navigation' disabled in various ways - but to describe a simple fail case.

—

• With default configuration on a blank line with a C++ file open...
• add a lot of spaces so the cursor has many behind it (8 or so)
• ctrl+Backspace
• notice ALL spaces are deleted.

Change the preferences so 'Camel Case Navigation' is disabled.

• do the same, as above.
• NOTICE ONLY ONE SPACE IS DELETED.

Since this is totally unrelated to camel case it should ofcourse work the same.