Odd colored lines are visible between distant block edges. It's most noticeable on light colored blocks. Different video settings don't appear to resolve this issue. This may affect only some operating systems as I don't have the problem on Windows.
The screenshot I've attached shows the issue in a superflat quartz block world with the debug screen.
Thank you for your report.
However, your ticket has been resolved as a duplicate.
This issue has been linked to the original bugreport: MC-72078. You can find or add further information on that report.
Please search before reporting any bugs, as it's likely that one exists already.