Fixed the implementation of sysData.center() on Windows to be thread-safe; also added center() to the _xSysData interface.

1 files changed, 1 insertions, 0 deletions

diff --git a/sysdata.go b/sysdata.go
index 9e6e384..dec0e27 100644
--- a/sysdata.go
+++ b/sysdata.go
@@ -41,6 +41,7 @@ var _xSysData interface {
 	len() int
 	setAreaSize(int, int)
 	repaintAll()
+	center()
 } = &sysData{} // this line will error if there's an inconsistency
 
 // signal sends the event signal. This raise is done asynchronously to avoid deadlocking the UI task.