Handling of `c-parse-state'. Fix low level bug.

progmodes/cc-engine.el (c-remove-stale-state-cache-backwards): Add
"CASE 3.5" to handle `cache-pos' being only slightly before `here'.

1 files changed, 8 insertions, 4 deletions

diff --git a/lisp/progmodes/cc-engine.el b/lisp/progmodes/cc-engine.el
index f5285a6bcfe..520b7e573bf 100644
--- a/lisp/progmodes/cc-engine.el
+++ b/lisp/progmodes/cc-engine.el
@@ -3135,16 +3135,20 @@ comment at the start of cc-engine.el for more info."
         nil))                           ; for the cond
 
      ((save-restriction
-        (narrow-to-region too-far-back (point-max))
-        (setq ren (c-safe (c-sc-scan-lists pos -1 -1))))
-
+        (narrow-to-region too-far-back (point-max))
+        (setq ren (c-safe (c-sc-scan-lists pos -1 -1))))
       ;; CASE 3: After a }/)/] before `here''s BOL.
       (list (1+ ren) (and dropped-cons pos) nil)) ; Return value
 
+     ((progn (setq good-pos (c-state-lit-beg (c-point 'bopl here-bol)))
+             (>= cache-pos good-pos))
+      ;; CASE 3.5: Just after an existing entry in `c-state-cache' on `here''s
+      ;; line or the previous line.
+      (list cache-pos nil nil))
+
      (t
       ;; CASE 4; Best of a bad job: BOL before `here-bol', or beginning of
       ;; literal containing it.
-      (setq good-pos (c-state-lit-beg (c-point 'bopl here-bol)))
       (list good-pos (and dropped-cons good-pos) nil)))))