CC Mode. Preserve space syntax-table props in open strings

This fixes bug#68111, allowing, e.g., backward-kill-word to
work properly.

* lisp/progmodes/cc-mode.el (c-clear-string-fences): On an open
string which isn't followed by another string, remove the
syntax-table properties just from template delimiters rather
than setting the syntax-table properties of all the string to
punctuation.

diff --git a/lisp/progmodes/cc-mode.el b/lisp/progmodes/cc-mode.el
index 4842de15164b492ee8b5246ac0b12780c7fdcad8..b4356c1c88747743efa4f0ef174e4968979d4517 100644 (file)
--- a/lisp/progmodes/cc-mode.el
+++ b/lisp/progmodes/cc-mode.el
@@ -1377,8 +1377,14 @@ Note that the style variables are always made local to the buffer."
                       (not (nth 3 s))
                       (c-get-char-property (1- (point)) 'c-fl-syn-tab))
                    (c-put-char-property pos 'syntax-table '(1))
-                   (c-put-char-properties (1+ pos) (c-point 'eol pos)
-                                          'syntax-table '(1)))
+                   ;; Remove syntax-table text properties from template
+                   ;; delimiters.
+                   (c-clear-char-property-with-value
+                    (1+ pos) (c-point 'eol pos)
+                    'syntax-table c-<-as-paren-syntax)
+                   (c-clear-char-property-with-value
+                    (1+ pos) (c-point 'eol pos)
+                    'syntax-table c->-as-paren-syntax))
                  (setq pos (point)))
              (setq pos (1+ pos)))))))))