patch 8.0.0917: MS-Windows:CTRL-C handling in terminal window is wrong

Problem:    MS-Windows:CTRL-C handling in terminal window is wrong
Solution:   Pass CTRL-C as a key. Turn CTRL-BREAK into a key stroke. (Yasuhiro
            Matsumoto, closes #1965)
diff --git a/src/os_win32.c b/src/os_win32.c
index 496f95f..c6d9ad1 100644
--- a/src/os_win32.c
+++ b/src/os_win32.c
@@ -3741,6 +3741,9 @@
 handler_routine(
     DWORD dwCtrlType)
 {
+    INPUT_RECORD ir;
+    DWORD out;
+
     switch (dwCtrlType)
     {
     case CTRL_C_EVENT:
@@ -3750,6 +3753,16 @@
 
     case CTRL_BREAK_EVENT:
 	g_fCBrkPressed	= TRUE;
+	ctrl_break_was_pressed = TRUE;
+	/* ReadConsoleInput is blocking, send a key event to continue. */
+	ir.EventType = KEY_EVENT;
+	ir.Event.KeyEvent.bKeyDown = TRUE;
+	ir.Event.KeyEvent.wRepeatCount = 1;
+	ir.Event.KeyEvent.wVirtualKeyCode = VK_CANCEL;
+	ir.Event.KeyEvent.wVirtualScanCode = 0;
+	ir.Event.KeyEvent.dwControlKeyState = 0;
+	ir.Event.KeyEvent.uChar.UnicodeChar = 0;
+	WriteConsoleInput(g_hConIn, &ir, 1, &out);
 	return TRUE;
 
     /* fatal events: shut down gracefully */