patch 8.0.0913: MS-Windows: CTRL-C kills shell in terminal window

Problem:    MS-Windows: CTRL-C kills shell in terminal window instead of the
            command running in the shell.
Solution:   Make CTRL-C only send a CTRL_C_EVENT and have CTRL-BREAK kill the
            job. (partly by Yasuhiro Matsumoto, closes #1962)

src/globals.h

@@ -1671,6 +1671,10 @@ EXTERN int  did_echo_string_emsg INIT(= FALSE);
 EXTERN int *eval_lavars_used INIT(= NULL);
 #endif
 
+#ifdef WIN3264
+EXTERN int ctrl_break_was_pressed = FALSE;
+#endif
+
 /*
  * Optional Farsi support.  Include it here, so EXTERN and INIT are defined.
  */

src/gui_w32.c

@@ -1840,6 +1840,7 @@ process_message(void)
 	{
 	    trash_input_buf();
 	    got_int = TRUE;
+	    ctrl_break_was_pressed = TRUE;
 	    string[0] = Ctrl_C;
 	    add_to_input_buf(string, 1);
 	}

src/os_win32.c

@@ -6296,6 +6296,7 @@ mch_breakcheck(int force)
 #ifndef FEAT_GUI_W32	    /* never used */
     if (g_fCtrlCPressed || g_fCBrkPressed)
     {
+	ctrl_break_was_pressed = g_fCBrkPressed;
 	g_fCtrlCPressed = g_fCBrkPressed = FALSE;
 	got_int = TRUE;
     }

src/terminal.c

@@ -1016,6 +1016,9 @@ term_vgetc()
     ++no_mapping;
     ++allow_keys;
     got_int = FALSE;
+#ifdef WIN3264
+    ctrl_break_was_pressed = FALSE;
+#endif
     c = vgetc();
     got_int = FALSE;
     --no_mapping;
@@ -1201,11 +1204,14 @@ terminal_loop(void)
 	may_send_sigint(c, curbuf->b_term->tl_job->jv_pid, 0);
 #endif
 #ifdef WIN3264
+	/* On Windows we do not know whether the job can handle CTRL-C itself
+	 * or not.  Therefore CTRL-C only sends a CTRL_C_EVENT to avoid killing
+	 * the shell instead of a command running in the shell.
+	 * Use CTRL-BREAK to kill the job. */
 	if (c == Ctrl_C)
-	    /* We don't know if the job can handle CTRL-C itself or not, this
-	     * may kill the shell instead of killing the command running in the
-	     * shell. */
-	    mch_signal_job(curbuf->b_term->tl_job, (char_u *)"quit");
+	    mch_signal_job(curbuf->b_term->tl_job, (char_u *)"int");
+	if (ctrl_break_was_pressed)
+	    mch_signal_job(curbuf->b_term->tl_job, (char_u *)"kill");
 #endif
 
 	if (c == (termkey == 0 ? Ctrl_W : termkey) || c == Ctrl_BSL)

src/version.c

@@ -769,6 +769,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    913,
 /**/
     912,
 /**/