Add 'font-lock-maximum-decoration' levels for Python

* etc/NEWS: New entry under Python mode.

* lisp/progmodes/python.el (python-font-lock-keywords-level-1)
(python-font-lock-keywords-level-2)
(python-font-lock-keywords-maximum-decoration): New variables
based off the incumbent 'python-font-lock-keywords'.
(python-font-lock-keywords): Change it to a list of the new
symbols, for use in the 'car' of 'font-lock-defaults'.
(python-mode): Set the 'car' of 'font-lock-defaults' to the
value of 'python-font-lock-keywords', instead of the symbol
'python-font-lock-keywords'.

1 files changed, 7 insertions, 0 deletions

diff --git a/etc/NEWS b/etc/NEWS
index f30ab698233..28e5d39c52f 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -384,6 +384,13 @@ bound to 'C-c C-f'.
 when escaping text and in addition all numeric entities when
 unescaping text.
 
+** Python mode
+
+---
+*** Python mode supports three different font lock decoration levels.
+The maximum level is used by default; customize
+'font-lock-maximum-decoration' to tone down the decoration.
+
 ** Dired
 
 +++