FIX page_token feature about messages, threads

[kazuya030]

page_token parameter changed to be used only in page_and_trim
internaly, and not accessed externally (messages, threads)

Paging seems to have a bug. This code can test it and should return 200, but now returns 100.

# should return 200
length(unique(id(messages(num_results = 200)))) 

This response to #19

[jimhester]

I ended up fixing this slightly more simply 94ba42c

length(unique(id(messages(num_results = 200)))) 
#> [1] 200

Thank you for the pull request, it let me know where the issue was!

[kazuya030]

Thank you for your response.
However, the problem seems to exist yet.
For, example by below code. ids shold be larger than 100 and smaller than 1000

ids = id(messages(search = "in:sent -is:chat after:15-12-01 before:16-01-01", num_results = 1000))

then, master branch returns length(ids) = 1000
On the contrary, my branch kazuya030:fixPageToken returns ,length(ids) = 392, in my case.

I don't understand this clearly.
If you have an idea, please teach me, plrease.

Sincerely, yours.

[jimhester]

You are correct the previous fix was incomplete, b48757a should now produce the same results with either fork.

[kazuya030]

Thank youfor your quick response.
This libraly is very useful thank you.