I want to copy the text message instead. How do I do it?

so a summary, Ctrl+C doesn't copy chat(not chat log).

I think you're misunderstanding how the copy function works. you hover over a chat message and press control + C and then it copies that line to your clipboard. It seems like you are expecting it to copy from the input box which is already a vanilla feature.

I assume you mean the full message rather than the single line?

whatever I'm writing into the chat I mean.(Like /fill [coords1] Ctrl+C > move> Ctrl+v write new coords

Could you draw a diagram of what you're trying to explain? I have no idea what that command is supposed to do.

No. Not even hovering over the input box allowed me to copy the text of the input box is what I meant. Your method is like overriding Vanilla's method to copy the inputbox content

Oh okay that makes much more sense, thank you. I will look into this and see what i can do.