Issue Description:

The hang glider bar does not always display correct in normal camera view (not F5).

What happens:

In certain circumstances, the glider bar will disappear and instead the player's hands (holding the glider) will appear instead.

I believe this is caused by the durability bar dropping and causing the item to re-render.

What you expected to happen:

The glider bar should display consistently.

Steps to reproduce (important):

1. Spawn in a fresh glider.
2. Be in survival mode (so durability will drop).
3. Equip and use the glider until durability drains (about 5 seconds).

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Affected Versions (Do not use "latest"):

• OpenGlider: 1.10.2-0.1.2
• Minecraft: 1.10.2
• Forge: 12.18.3.2185