Scratch 1.4 from rapps, the context menu of right cat opens on left mouse button

0.4.11-RC-23-gb5fef42 gcc dbg linux
Scratch 1.4 from rapps

There is a cat at the right side of the screen.

Observed result
right clicking the cat opens the context menu and Left-click opens the context menu erroneously as well

Expected result
I double-checked: In WinXPSP3 Right-click opens the context menu, left click does nothing

rightCat_ContextMenu.webm
0.4.11-RC-23-gb5fef42__scratchContextMenu.log (ros logs nothing when clicking the cat with left or right mouse button)

I think the bug existed for a longer time in ros already, but my past notes unfortunately were not distinct enough to say for sure.