You can switch fishing rods while the line is still cast

The Bug:

You can switch fishing rods while the line is still cast.

Steps to Reproduce:

1. Obtain two fishing rods and place them next to one another in your hotbar.
2. Use one of the fishing rods.
3. Switch to the other fishing rod.
4. Take note as to whether or not you can switch fishing rods while the line is still cast.

Observed Behavior:

You can switch fishing rods while the line is still cast.

Expected Behavior:

You would not be able to switch fishing rods while the line is still cast.

Expected Behavior:

You would not be able to switch fishing rods while the line is still cast.

Code Analysis & Fix:

Code analysis and fix by Apollo can be found in this comment.