X11: fixed initializion of `hasShmExtension` in `#initializeScreenProperties`
The extension name is 'MIT-SHM', not 'MIT_SHM'.
--- a/XWorkstation.st Tue Jul 17 08:03:06 2018 +0200
+++ b/XWorkstation.st Thu Jul 19 20:54:26 2018 +0100
@@ -9517,7 +9517,7 @@
super initializeScreenProperties.
hasShapeExtension := self hasExtension:#SHAPE.
- hasShmExtension := self hasExtension:#MIT_SHM.
+ hasShmExtension := self hasExtension:#'MIT-SHM'.
hasDPSExtension := self hasExtension:#DPS.
hasXVideoExtension := self hasExtension:#XVideo.
hasMbufExtension := self hasExtension:#'Multi-Buffering'.