Revert "Enhance Python font-lock to support multilines"

This reverts commit 4915ca5dd4245a909c046e6691e8d4a1919890c8.

We have found that there are performance issues when editing a large
file.  The issue can be reproduced as follows:

1. emacs -Q
2. Open large Python file (e.g. turtle.py in Python)
3. Near the top of the buffer, enter open paren and some characters.

The above commit extends the region to be font-locked using
`python-nav-end-of-statement'.  However, if there are unbalanced
parens, it may move point to the end of the buffer.  This causes
almost the entire buffer to be font-locked, which is not acceptable
for large files.

1 files changed, 0 insertions, 144 deletions

diff --git a/test/lisp/progmodes/python-tests.el b/test/lisp/progmodes/python-tests.el
index cbaf5b698bd..e1b4c0a74c0 100644
--- a/test/lisp/progmodes/python-tests.el
+++ b/test/lisp/progmodes/python-tests.el
@@ -136,20 +136,6 @@ STRING, it is skipped so the next STRING occurrence is selected."
            while pos
            collect (cons pos (get-text-property pos 'face))))
 
-(defun python-tests-assert-faces-after-change (content faces search replace)
-  "Assert that font faces for CONTENT are equal to FACES after change.
-All occurrences of SEARCH are changed to REPLACE."
-  (python-tests-with-temp-buffer
-   content
-   ;; Force enable font-lock mode without jit-lock.
-   (rename-buffer "*python-font-lock-test*" t)
-   (let (noninteractive font-lock-support-mode)
-     (font-lock-mode))
-   (while
-       (re-search-forward search nil t)
-     (replace-match replace))
-   (should (equal faces (python-tests-get-buffer-faces)))))
-
 (defun python-tests-self-insert (char-or-str)
   "Call `self-insert-command' for chars in CHAR-OR-STR."
   (let ((chars
@@ -297,13 +283,6 @@ p = (1 + 2)
    "def 1func():"
    '((1 . font-lock-keyword-face) (4))))
 
-(ert-deftest python-font-lock-keywords-level-1-3 ()
-  (python-tests-assert-faces
-   "def \\
-        func():"
-   '((1 . font-lock-keyword-face) (4)
-     (15 . font-lock-function-name-face) (19))))
-
 (ert-deftest python-font-lock-assignment-statement-1 ()
   (python-tests-assert-faces
    "a, b, c = 1, 2, 3"
@@ -495,129 +474,6 @@ def f(x: CustomInt) -> CustomInt:
      (136 . font-lock-operator-face) (137)
      (144 . font-lock-keyword-face) (150))))
 
-(ert-deftest python-font-lock-assignment-statement-multiline-1 ()
-  (python-tests-assert-faces-after-change
-   "
-[
-    a,
-    b
-] # (
-    1,
-    2
-)
-"
-   '((1)
-     (8 . font-lock-variable-name-face) (9)
-     (15 . font-lock-variable-name-face) (16)
-     (19 . font-lock-operator-face) (20))
-   "#" "="))
-
-(ert-deftest python-font-lock-assignment-statement-multiline-2 ()
-  (python-tests-assert-faces-after-change
-   "
-[
-    *a
-] # 5, 6
-"
-   '((1)
-     (8 . font-lock-operator-face)
-     (9 . font-lock-variable-name-face) (10)
-     (13 . font-lock-operator-face) (14))
-   "#" "="))
-
-(ert-deftest python-font-lock-assignment-statement-multiline-3 ()
-  (python-tests-assert-faces-after-change
-   "a\\
-    ,\\
-    b\\
-    ,\\
-    c\\
-    #\\
-    1\\
-    ,\\
-    2\\
-    ,\\
-    3"
-   '((1 . font-lock-variable-name-face) (2)
-     (15 . font-lock-variable-name-face) (16)
-     (29 . font-lock-variable-name-face) (30)
-     (36 . font-lock-operator-face) (37))
-   "#" "="))
-
-(ert-deftest python-font-lock-assignment-statement-multiline-4 ()
-  (python-tests-assert-faces-after-change
-   "a\\
-    :\\
-    int\\
-    #\\
-    5"
-   '((1 . font-lock-variable-name-face) (2)
-     (15 . font-lock-builtin-face) (18)
-     (24 . font-lock-operator-face) (25))
-   "#" "="))
-
-(ert-deftest python-font-lock-assignment-statement-multiline-5 ()
-  (python-tests-assert-faces-after-change
-   "(\\
-    a\\
-)\\
-    #\\
-    5\\
-    ;\\
-    (\\
-    b\\
-    )\\
-    #\\
-    6"
-   '((1)
-     (8 . font-lock-variable-name-face) (9)
-     (18 . font-lock-operator-face) (19)
-     (46 . font-lock-variable-name-face) (47)
-     (60 . font-lock-operator-face) (61))
-   "#" "="))
-
-(ert-deftest python-font-lock-assignment-statement-multiline-6 ()
-  (python-tests-assert-faces-after-change
-   "(
-    a
-)\\
-    #\\
-    5\\
-    ;\\
-    (
-    b
-    )\\
-    #\\
-    6"
-   '((1)
-     (7 . font-lock-variable-name-face) (8)
-     (16 . font-lock-operator-face) (17)
-     (43 . font-lock-variable-name-face) (44)
-     (56 . font-lock-operator-face) (57))
-   "#" "="))
-
-(ert-deftest python-font-lock-operator-1 ()
-  (python-tests-assert-faces
-   "1 << 2 ** 3 == +4%-5|~6&7^8%9"
-   '((1)
-     (3 . font-lock-operator-face) (5)
-     (8 . font-lock-operator-face) (10)
-     (13 . font-lock-operator-face) (15)
-     (16 . font-lock-operator-face) (17)
-     (18 . font-lock-operator-face) (20)
-     (21 . font-lock-operator-face) (23)
-     (24 . font-lock-operator-face) (25)
-     (26 . font-lock-operator-face) (27)
-     (28 . font-lock-operator-face) (29))))
-
-(ert-deftest python-font-lock-operator-2 ()
-  "Keyword operators are font-locked as keywords."
-  (python-tests-assert-faces
-   "is_ is None"
-   '((1)
-     (5 . font-lock-keyword-face) (7)
-     (8 . font-lock-constant-face))))
-
 (ert-deftest python-font-lock-escape-sequence-string-newline ()
   (python-tests-assert-faces
    "'\\n'