Ignore BUFFER_SWITCH_EVENT events for the purposes of input-pending-p.

 src/keyboard.c (readable_events): When FLAGS include
 READABLE_EVENTS_FILTER_EVENTS, ignore BUFFER_SWITCH_EVENT events.
 This avoids returning non-nil from input-pending-p when only such
 events are in the queue.

Fixes: debbugs:18856

1 files changed, 2 insertions, 1 deletions

diff --git a/src/keyboard.c b/src/keyboard.c
index 32d14ab0760..e16ee51ee0e 100644
--- a/src/keyboard.c
+++ b/src/keyboard.c
@@ -3495,7 +3495,8 @@ readable_events (int flags)
                        && event->part == scroll_bar_handle
                        && event->modifiers == 0)
 #endif
-                  )
+                  && !((flags & READABLE_EVENTS_FILTER_EVENTS)
+                       && event->kind == BUFFER_SWITCH_EVENT))
                 return 1;
               event++;
               if (event == kbd_buffer + KBD_BUFFER_SIZE)