Another internal SelectReplaceHighlightFormat question

[seandoyle]

In the SelectReplaceHighlightFormat code there is the following statement:
Function SelectReplaceHighlightFormat

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__ProcessMemory m.Alloc(hwndre 1000)

I know from the documentation that this is for allocating memory in the context of the process that the window handle belongs to. What's unclear to me is - what is the relation of the size of the buffer and the size of the text that is being updated?

In a subsequent line there is this command:
Function SelectReplaceHighlightFormat

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SendMessage hwndre EM_REPLACESEL 0 replacetext

My question: if replaceText.len > 1000 - should the buffer be larger? Or is this irrelevant - SendMessage manages its own memory and the Alloc is just for the target application having enough memory to do housekeeping (which may mean that it needs to be larger).

Thanks