Touching Mouse Pointer returns true even if mouse is not on the stage

[BryceLTaylor]

Expected Behavior

If the mouse isn't on the stage the "touching mouse pointer" block won't return true.

Actual Behavior

If a sprite is partially of the edge of the screen the "touching mouse pointer" block will return true if the mouse is over the part of the sprite that is off the stage.

Steps to Reproduce

Create a new project
drag the cat partially off the stage
Add the following stack
When green flag clicked forever if touching mouse pointer change color effect by 15
place the mouse off the stage but over where the cat would be
Note: the cat changes color

Operating System and Browser

Mac Chrome

[BryceLTaylor]

This may be related to #2851

[adroitwhiz]

This matches Scratch 2.0 behavior.

[apple502j]

@adroitwhiz This bug has been exploited to make some buttons (such as love) unclickable.