highlight-changes-global-modes

highlight-changes-global-modes is a variable defined in `hilit-chg.el'.
Its value is

t

Documentation:
Determine whether a buffer is suitable for global Highlight Changes mode.

A function means call that function to decide: if it returns non-nil,
the buffer is suitable.

A list means the elements are major modes suitable for Highlight
Changes mode, or a list whose first element is `not' followed by major
modes which are not suitable.

A value of t means the buffer is suitable if it is visiting a file and
its name does not begin with ` ' or `*'.

A value of nil means no buffers are suitable for `global-highlight-changes-mode'
(effectively disabling the mode).

Example:
(c-mode c++-mode)
means that Highlight Changes mode is turned on for buffers in C and C++
modes only.

You can customize this variable.