Bug Report: Invalid Legacy Formatting Warning Specifically with sendActionBar in Older Minecraft Versions

[Bram1903]

Description:
When utilizing the Adventure library's sendActionBar method in a Bukkit plugin on older Minecraft versions (1.8 in this example), a warning related to legacy formatting codes is being erroneously thrown. This warning is specific to the sendActionBar method and does not occur with other methods such as sendMessage or sendTitle. Despite not employing any legacy formatting codes in the codebase, the warning persists, indicating a potential issue within the Adventure library's implementation for older Minecraft versions.

Steps to Reproduce:

1. Install the provided plugin on a Minecraft server running version 1.8.
2. Execute the command associated with the plugin that triggers the sendActionBar method, e.g., /showcase.
3. Observe the console logs for warnings related to legacy formatting codes.

Repository including a showcase project: AdventureBugExample

The plugin can easily be tested by running gradle runServer. This will fire up a paper server running 1.8.8, with the latest build of the plugin.

Expected Behavior:
The sendActionBar method should execute without any warnings related to legacy formatting codes, similar to other message-sending methods such as sendMessage and sendTitle.

Actual Behavior:
Warnings related to legacy formatting codes are specifically thrown when utilizing the sendActionBar method, despite the absence of legacy formatting codes in the codebase. Other message-sending methods do not trigger these warnings.

Additional Information:

• This issue is not reproducible in version 1.20.4 of Minecraft.
• The warning specifically occurs with the sendActionBar method, suggesting a potential discrepancy or bug in its implementation for older Minecraft versions.

Environment:

• Minecraft Version: 1.8
• Server Software: Paper
• Adventure Library Version (Bukkit): 4.3.2
• Operating System: Windows

Possibly related to #86

[zml2008]

There's a client bug in older Minecraft versions that causes the client to not properly handle components sent to the action bar, the legacy text there us a workaround. iirc the legacy warning is gated behind a system property, so just don't enable it if you're working in legacy environments