patch 8.0.1210: CTRL-G and CTRL-T are ignored with typeahead

Problem:    When typing a search pattern CTRL-G and CTRL-T are ignored when
            there is typeahead.
Solution:   Don't pass SEARCH_PEEK and don't call char_avail(). (haya14busa,
            closes #2233)

src/ex_getln.c

@@ -158,6 +158,20 @@ trigger_cmd_autocmd(int typechar, int evt)
 }
 #endif
 
+/*
+ * Abandon the command line.
+ */
+    static void
+abandon_cmdline(void)
+{
+    vim_free(ccline.cmdbuff);
+    ccline.cmdbuff = NULL;
+    if (msg_scrolled == 0)
+	compute_cmdrow();
+    MSG("");
+    redraw_cmdline = TRUE;
+}
+
 /*
  * getcmdline() - accept a command line starting with firstc.
  *
@@ -1702,11 +1716,8 @@ getcmdline(
 		if (p_is && !cmd_silent && (firstc == '/' || firstc == '?'))
 		{
 		    pos_T  t;
-		    int    search_flags = SEARCH_KEEP + SEARCH_NOOF
+		    int    search_flags = SEARCH_KEEP + SEARCH_NOOF;
-							     + SEARCH_PEEK;
 
-		    if (char_avail())
-			continue;
 		    cursor_off();
 		    out_flush();
 		    if (c == Ctrl_G)
@@ -2083,15 +2094,8 @@ returncmd:
 	}
 #endif
 
-	if (gotesc)	    /* abandon command line */
+	if (gotesc)
-	{
+	    abandon_cmdline();
-	    vim_free(ccline.cmdbuff);
-	    ccline.cmdbuff = NULL;
-	    if (msg_scrolled == 0)
-		compute_cmdrow();
-	    MSG("");
-	    redraw_cmdline = TRUE;
-	}
     }
 
     /*

src/testdir/test_search.vim

@@ -356,6 +356,26 @@ func Test_search_cmdline4()
   bw!
 endfunc
 
+func Test_search_cmdline5()
+  if !exists('+incsearch')
+    return
+  endif
+  " Do not call test_override("char_avail", 1) so that <C-g> and <C-t> work
+  " regardless char_avail.
+  new
+  call setline(1, ['  1 the first', '  2 the second', '  3 the third'])
+  set incsearch
+  1
+  call feedkeys("/the\<c-g>\<c-g>\<cr>", 'tx')
+  call assert_equal('  3 the third', getline('.'))
+  $
+  call feedkeys("?the\<c-t>\<c-t>\<c-t>\<cr>", 'tx')
+  call assert_equal('  2 the second', getline('.'))
+  " clean up
+  set noincsearch
+  bw!
+endfunc
+
 " Tests for regexp with various magic settings
 func Test_search_regexp()
   enew!

src/version.c

@@ -761,6 +761,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1210,
 /**/
     1209,
 /**/