Pressing space while the cursor is over a context node shows the nodes, and not as expected the blocks menu.

Repro steps:
1. On OSX, create a VFX context node
2. Position the mouse cursor over the contextual node and press space
3. Observe the context menu shows nodes
4. Click to close the menu and press space again
5. The context block shows
6. Add any block
7. Press space again and observe how the node menu shows the first time again

Expected outcome: similar to Win, the space bar to always trigger the block menu when the mouse cursor is over a contextual node