vim-patch:8.2.2295: incsearch does not detect empty pattern properly

Problem:    Incsearch does not detect empty pattern properly.
Solution:   Return magic state when skipping over a pattern. (Christian
            Brabandt, closes vim/vim#7612, closes vim/vim#6420)

https://github.com/vim/vim/commit/d93a7fc1a98a58f8101ee780d4735079ad99ae35

1 files changed, 9 insertions, 8 deletions

diff --git a/src/nvim/regexp.c b/src/nvim/regexp.c
index e58a8fa06a..7335345161 100644
--- a/src/nvim/regexp.c
+++ b/src/nvim/regexp.c
@@ -316,11 +316,7 @@ static int re_has_z;            ///< \z item detected
 static unsigned regflags;       ///< RF_ flags for prog
 static int had_eol;             ///< true when EOL found by vim_regcomp()
 
-static int reg_magic;           // magicness of the pattern:
-#define MAGIC_NONE      1       // "\V" very unmagic
-#define MAGIC_OFF       2       // "\M" or 'magic' off
-#define MAGIC_ON        3       // "\m" or 'magic'
-#define MAGIC_ALL       4       // "\v" very magic
+static magic_T reg_magic;       ///< magicness of the pattern
 
 static int reg_string;          // matching with a string instead of a buffer
                                 // line
@@ -485,7 +481,7 @@ static char_u *skip_anyof(char *p)
 /// Skip strings inside [ and ].
 char *skip_regexp(char *startp, int delim, int magic)
 {
-  return skip_regexp_ex(startp, delim, magic, NULL, NULL);
+  return skip_regexp_ex(startp, delim, magic, NULL, NULL, NULL);
 }
 
 /// Call skip_regexp() and when the delimiter does not match give an error and
@@ -506,9 +502,11 @@ char *skip_regexp_err(char *startp, int delim, int magic)
 /// expression and change "\?" to "?".  If "*newp" is not NULL the expression
 /// is changed in-place.
 /// If a "\?" is changed to "?" then "dropped" is incremented, unless NULL.
-char *skip_regexp_ex(char *startp, int dirc, int magic, char **newp, int *dropped)
+/// If "magic_val" is not NULL, returns the effective magicness of the pattern
+char *skip_regexp_ex(char *startp, int dirc, int magic, char **newp, int *dropped,
+                     magic_T *magic_val)
 {
-  int mymagic;
+  magic_T mymagic;
   char *p = startp;
 
   if (magic) {
@@ -549,6 +547,9 @@ char *skip_regexp_ex(char *startp, int dirc, int magic, char **newp, int *droppe
       }
     }
   }
+  if (magic_val != NULL) {
+    *magic_val = mymagic;
+  }
   return p;
 }