[PATCH] Cygwin: console: Make cursor keys work in vim under ConEmu.

[Takashi Yano via Cygwin-patches]

- After commit 774b8996d1f3e535e8267be4eb8e751d756c2cec, cursor
  keys do not work in vim under ConEmu without cygwin-connector.
  This patch fixes the issue.
---
 winsup/cygwin/fhandler.h          |  1 +
 winsup/cygwin/fhandler_console.cc | 20 ++++++++++++++------
 2 files changed, 15 insertions(+), 6 deletions(-)

diff --git a/winsup/cygwin/fhandler.h b/winsup/cygwin/fhandler.h
index 76ad2aab0..b2957e4ee 100644
--- a/winsup/cygwin/fhandler.h
+++ b/winsup/cygwin/fhandler.h
@@ -2040,6 +2040,7 @@ class dev_console
   char *cons_rapoi;
   LONG xterm_mode_input;
   LONG xterm_mode_output;
+  bool cursor_key_app_mode;
 
   inline UINT get_console_cp ();
   DWORD con_to_str (char *d, int dlen, WCHAR w);
diff --git a/winsup/cygwin/fhandler_console.cc 
b/winsup/cygwin/fhandler_console.cc
index 3930c6068..5cb4343ea 100644
--- a/winsup/cygwin/fhandler_console.cc
+++ b/winsup/cygwin/fhandler_console.cc
@@ -243,6 +243,7 @@ fhandler_console::setup ()
       con.backspace_keycode = CERASE;
       con.cons_rapoi = NULL;
       shared_console_info->tty_min_state.is_console = true;
+      con.cursor_key_app_mode = false;
     }
 }
 
@@ -289,6 +290,8 @@ fhandler_console::request_xterm_mode_input (bool req)
          GetConsoleMode (get_handle (), &dwMode);
          dwMode |= ENABLE_VIRTUAL_TERMINAL_INPUT;
          SetConsoleMode (get_handle (), dwMode);
+         if (con.cursor_key_app_mode) /* Restore DECCKM */
+           WriteConsoleA (get_output_handle (), "\033[?1h", 5, NULL, 0);
        }
     }
   else
@@ -2150,10 +2153,6 @@ fhandler_console::char_command (char c)
          break;
        case 'h': /* DECSET */
        case 'l': /* DECRST */
-         if (c == 'h')
-           con.screen_alternated = true;
-         else
-           con.screen_alternated = false;
          wpbuf.put (c);
          /* Just send the sequence */
          wpbuf.send (get_output_handle ());
@@ -2161,8 +2160,15 @@ fhandler_console::char_command (char c)
            {
              bool need_fix_tab_position = false;
              for (int i = 0; i < con.nargs; i++)
-               if (con.args[i] == 1049)
-                 need_fix_tab_position = true;
+               {
+                 if (con.args[i] == 1049)
+                   {
+                     con.screen_alternated = (c == 'h');
+                     need_fix_tab_position = true;
+                   }
+                 if (con.args[i] == 1) /* DECCKM */
+                   con.cursor_key_app_mode = (c == 'h');
+               }
              /* Call fix_tab_position() if screen has been alternated. */
              if (need_fix_tab_position)
                fix_tab_position ();
@@ -2174,6 +2180,7 @@ fhandler_console::char_command (char c)
              con.scroll_region.Top = 0;
              con.scroll_region.Bottom = -1;
              con.savex = con.savey = -1;
+             con.cursor_key_app_mode = false;
            }
          wpbuf.put (c);
          /* Just send the sequence */
@@ -3077,6 +3084,7 @@ fhandler_console::write (const void *vsrc, size_t len)
                  con.scroll_region.Top = 0;
                  con.scroll_region.Bottom = -1;
                  con.savex = con.savey = -1;
+                 con.cursor_key_app_mode = false;
                }
              /* ESC sequences below (e.g. OSC, etc) are left to xterm
                 emulation in xterm compatible mode, therefore, are not
-- 
2.26.2