win32: better detection of Alt key release

Commit 7874ca73b (win32: allow characters to be entered as ALTNNN)
made it possible to enter characters using Alt and a character code
on the numeric pad.  This required detecting the release of the
Alt key.

Sometimes this caused a problem when using Alt+Tab to cycle between
applications.  If Alt was released before Tab the code passed a tab
character to the application.

Avoid such issues by looking specifically for the release of the Alt
key.

1 files changed, 2 insertions, 1 deletions

diff --git a/win32/termios.c b/win32/termios.c
index 708acfa9f..605f73328 100644
--- a/win32/termios.c
+++ b/win32/termios.c
@@ -40,7 +40,8 @@ int64_t FAST_FUNC read_key(int fd, char *buf UNUSED_PARAM, int timeout)
                 state = record.Event.KeyEvent.dwControlKeyState;
                 if (!record.Event.KeyEvent.bKeyDown) {
                         /* ignore all key up events except Alt */
-                        if (alt_pressed && !(state & LEFT_ALT_PRESSED))
+                        if (alt_pressed && !(state & LEFT_ALT_PRESSED) &&
+                                        record.Event.KeyEvent.wVirtualKeyCode == VK_MENU)
                                 alt_pressed = FALSE;
                         else
                                 continue;