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The line length for chat is a fixed size that is below the level that an addon can modify. That is why extra long chat messages would get truncated in pChat/rChat because those addons insert additional stuff in the chat line depending on settings causing the modified message to exceed the fixed line length.
A popup text box could accept a larger length of text, but then it would have to pass it in to the chat window in line-length chunks and require the user to hit enter at the end of each chunk.
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