vim-patch:8.1.1087: tag stack is incorrect after CTRL-T and then :tag

Problem:    tag stack is incorrect after CTRL-T and then :tag
Solution:   Handle DT_TAG differently. (test by Andy Massimino, closes vim/vim#3944,
            closes vim/vim#4177)
7559dcef6c

src/nvim/tag.c

@@ -436,11 +436,15 @@ do_tag (
         tagmatchname = vim_strsave(name);
       }
 
-      if (type == DT_TAG || type == DT_SELECT || type == DT_JUMP
+      if (type == DT_SELECT || type == DT_JUMP
           || type == DT_LTAG) {
         cur_match = MAXCOL - 1;
       }
-      max_num_matches = cur_match + 1;
+      if (type == DT_TAG) {
+        max_num_matches = MAXCOL;
+      } else {
+        max_num_matches = cur_match + 1;
+      }
 
       /* when the argument starts with '/', use it as a regexp */
       if (!no_regexp && *name == '/') {
@@ -495,7 +499,7 @@ do_tag (
       if (type == DT_CSCOPE && num_matches > 1) {
         cs_print_tags();
         ask_for_selection = true;
-      } else if (type == DT_TAG) {
+      } else if (type == DT_TAG && *tag != NUL) {
         // If a count is supplied to the ":tag <name>" command, then
         // jump to count'th matching tag.
         cur_match = count > 0 ? count - 1 : 0;

src/nvim/testdir/test_tagjump.vim

@@ -258,4 +258,77 @@ func Test_tagjump_etags()
   bwipe!
 endfunc
 
+func Test_tag_with_count()
+  call writefile([
+	\ 'test	Xtest.h	/^void test();$/;"	p	typeref:typename:void	signature:()',
+	\ ], 'Xtags')
+  call writefile([
+	\ 'main	Xtest.c	/^int main()$/;"	f	typeref:typename:int	signature:()',
+	\ 'test	Xtest.c	/^void test()$/;"	f	typeref:typename:void	signature:()',
+	\ ], 'Ytags')
+  cal writefile([
+	\ 'int main()',
+	\ 'void test()',
+	\ ], 'Xtest.c')
+  cal writefile([
+	\ 'void test();',
+	\ ], 'Xtest.h')
+  set tags=Xtags,Ytags
+
+  new Xtest.c
+  let tl = taglist('test', 'Xtest.c')
+  call assert_equal(tl[0].filename, 'Xtest.c')
+  call assert_equal(tl[1].filename, 'Xtest.h')
+
+  tag test
+  call assert_equal(bufname('%'), 'Xtest.c')
+  1tag test
+  call assert_equal(bufname('%'), 'Xtest.c')
+  2tag test
+  call assert_equal(bufname('%'), 'Xtest.h')
+
+  set tags&
+  call delete('Xtags')
+  call delete('Ytags')
+  bwipe Xtest.h
+  bwipe Xtest.c
+  call delete('Xtest.h')
+  call delete('Xtest.c')
+endfunc
+
+func Test_tagnr_recall()
+  call writefile([
+	\ 'test	Xtest.h	/^void test();$/;"	p',
+	\ 'main	Xtest.c	/^int main()$/;"	f',
+	\ 'test	Xtest.c	/^void test()$/;"	f',
+	\ ], 'Xtags')
+  cal writefile([
+	\ 'int main()',
+	\ 'void test()',
+	\ ], 'Xtest.c')
+  cal writefile([
+	\ 'void test();',
+	\ ], 'Xtest.h')
+  set tags=Xtags
+
+  new Xtest.c
+  let tl = taglist('test', 'Xtest.c')
+  call assert_equal(tl[0].filename, 'Xtest.c')
+  call assert_equal(tl[1].filename, 'Xtest.h')
+
+  2tag test
+  call assert_equal(bufname('%'), 'Xtest.h')
+  pop
+  call assert_equal(bufname('%'), 'Xtest.c')
+  tag
+  call assert_equal(bufname('%'), 'Xtest.h')
+
+  set tag&
+  call delete('Xtags')
+  bwipe Xtest.h
+  bwipe Xtest.c
+  call delete('Xtest.h')
+  call delete('Xtest.c')
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab