Lock Stack's mutex lock like with all other Controls.

1 files changed, 9 insertions, 0 deletions

diff --git a/stack.go b/stack.go
index 269bee4..f66bc3d 100644
--- a/stack.go
+++ b/stack.go
@@ -50,6 +50,9 @@ func (s *Stack) SetStretchy(index int) {
 }
 
 func (s *Stack) make(window *sysData) error {
+	s.lock.Lock()
+	defer s.lock.Unlock()
+
 	for i, c := range s.controls {
 		err := c.make(window)
 		if err != nil {
@@ -61,6 +64,9 @@ func (s *Stack) make(window *sysData) error {
 }
 
 func (s *Stack) setRect(x int, y int, width int, height int) error {
+	s.lock.Lock()
+	defer s.lock.Unlock()
+
 	var stretchywid, stretchyht int
 
 	if len(s.controls) == 0 {		// do nothing if there's nothing to do
@@ -121,6 +127,9 @@ func (s *Stack) setRect(x int, y int, width int, height int) error {
 
 // The preferred size of a Stack is the sum of the preferred sizes of non-stretchy controls + (the number of stretchy controls * the largest preferred size among all stretchy controls).
 func (s *Stack) preferredSize() (width int, height int, err error) {
+	s.lock.Lock()
+	defer s.lock.Unlock()
+
 	max := func(a int, b int) int {
 		if a > b {
 			return a