vim-patch:8.0.1304: CTRL-G/CTRL-T don't work with incsearch and empty pattern

Problem:    CTRL-G/CTRL-T don't work with incsearch and empty pattern.
Solution:   Use the last search pattern. (Christian Brabandt, closes vim/vim#2292)

https://github.com/vim/vim/commit/d0480097177369a6ed91d47aba189ae647afcd68

3 files changed, 17 insertions, 2 deletions

diff --git a/src/nvim/ex_getln.c b/src/nvim/ex_getln.c
index e396a179a1..2178505874 100644
--- a/src/nvim/ex_getln.c
+++ b/src/nvim/ex_getln.c
@@ -1019,7 +1019,16 @@ static void command_line_next_incsearch(CommandLineState *s, bool next_match)
   ui_flush();
 
   pos_T  t;
+  char_u *pat;
   int search_flags = SEARCH_NOOF;
+
+
+  if (s->firstc == ccline.cmdbuff[0]) {
+    pat = last_search_pattern();
+  } else {
+    pat = ccline.cmdbuff;
+  }
+
   save_last_search_pattern();
 
   if (next_match) {
@@ -1039,7 +1048,7 @@ static void command_line_next_incsearch(CommandLineState *s, bool next_match)
   emsg_off++;
   s->i = searchit(curwin, curbuf, &t,
                   next_match ? FORWARD : BACKWARD,
-                  ccline.cmdbuff, s->count, search_flags,
+                  pat, s->count, search_flags,
                   RE_SEARCH, 0, NULL);
   emsg_off--;
   ui_busy_stop();
diff --git a/src/nvim/search.c b/src/nvim/search.c
index 89a7752e9f..9ae5754f80 100644
--- a/src/nvim/search.c
+++ b/src/nvim/search.c
@@ -335,6 +335,12 @@ restore_last_search_pattern(void)
   SET_NO_HLSEARCH(saved_no_hlsearch);
 }
 
+    char_u *
+last_search_pattern(void)
+{
+  return spats[RE_SEARCH].pat;
+}
+
 /*
  * Return TRUE when case should be ignored for search pattern "pat".
  * Uses the 'ignorecase' and 'smartcase' options.
diff --git a/src/nvim/version.c b/src/nvim/version.c
index 370c8ab5d3..ba2912ef29 100644
--- a/src/nvim/version.c
+++ b/src/nvim/version.c
@@ -193,7 +193,7 @@ static const int included_patches[] = {
   // 1307,
   // 1306,
   // 1305,
-  // 1304,
+  1304,
   // 1303,
   // 1302,
   // 1301,