What I expected to happen was...:
to get in minecart or ride pig/horse
What actually happened was...:
minecraft crashed
Steps to Reproduce:
1. set your sneak key to any mouse button 1,2 or 3
2. attempt to mount a horse pig or minecart
3. minecraft crashed
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kumasasa
Duplicate of MC-14126
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This issue has not been resolved for me in 13w19a.