The Bug:

The size of the chat preview field doesn't have a limit.

Because of this, when selectors are used within commands, the chat preview field scales to fix the text inside of it, which sometimes results in it being abnormally large. Not only does this have a notable impact on performance, but it looks quite bizarre.

Steps to Reproduce:

• Summon a command block minecart.

• /summon minecraft:command_block_minecart

• Summon multiple more command block minecarts by executing the command provided below several times.

• /execute at @e[type=minecraft:command_block_minecart] run summon minecraft:command_block_minecart

• Type the following command in chat without sending it.

• /say @e

• Look at the chat preview field.
• Take note as to whether or not the size of the chat preview field has a limit.

Observed Behavior:

The size of the chat preview field doesn't have a limit.

Expected Behavior:

The size of the chat preview field would have a limit.