Ensure that if we're called exactly on the threshold of a
NegativeTransition trigger that we reshedule to pick up
an idle time over the threshold.

Signed-off-by: Christopher James Halse Rogers 
<[email protected]>
---
 Xext/sync.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/Xext/sync.c b/Xext/sync.c
index c00e692..314b63e 100644
--- a/Xext/sync.c
+++ b/Xext/sync.c
@@ -2322,6 +2322,14 @@ IdleTimeBlockHandler(pointer env, struct timeval **wt, 
pointer LastSelectMask)
                break;
            }
        }
+       /* 
+        * We've been called exactly on the idle time, but we have a
+        * NegativeTransition trigger which requires a transition from an
+        * idle time greater than this.  Schedule a wakeup for the next
+        * millisecond so we won't miss a transition.
+        */
+       if (XSyncValueEqual (idle, *pIdleTimeValueLess))
+           AdjustWaitForDelay(wt, 1);
     }
     else if (pIdleTimeValueGreater)
     {
-- 
1.7.1

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