Eclipse text highlights

Question

In eclipse when I'm pressing 'ctrl' (no matter what next) part of my code turns red with a yellow background. What is this and how to disable it?

Also when this happens 'ctrl' + 'space' stop working until I restart eclipse.

here what it looks like this:

EDIT:

How to reproduce: start the auto completion (ctrl + space) on something you already wrote:

class.fun

step after the . and start the auto complition

now each time I hold ctrl, fun glows yellow:

class.fun

Answer 1

Might be on demand hyperlink navigation acting up.

Do you also see the text become underlined as you hover over it?

Try this:

Window->Preferences->General->Editors->Text Editors->Hyperlinking
[v] Enable on demand hyperlink style navigation
Default modifier key: [Ctrl]

Turn it off and Apply the change.

See if it makes a difference.

If it is not that, perhaps you find the culprit elsewhere in your preferences.