knitr adds ' --- ' to chunk names in external file, if 4 spaces follow

[jhmaindonald]

read_chunk("scripts/maps-code.R")
z<-knitr:::knit_code$get()
names(z)[16:18]
[1] "sp27-read" "sp27-spplot ----" "meuse-bubble ----"

For names 17 and 18, the line ended with '---- ', i.e. there
were four spaces at the end.

Why did 4 spaces get there. In RStudio version 0.98_308, as in the previous
development version, typing the 'Enter' key in a code file takes one, not to the
beginning of the next line, but to the end of a line that has four spaces.
(This, even though I turned off 'Auto-indent code after paste' under the Code
Editing option.) Before typing on a new line, I navigated to the start of the
line, without deleting the spaces.

I am using knitr_1.4.1

[jhmaindonald]

Actually, 1 space following the final '----' is enough to trigger the problem.
I have not tried other possibilities, e.g., '-- '.

It would be worth mentioning the use of knitr:::knit_code$get() in documents
that describe code externalization. It is a vital aid for checking out issues
with the input of external code chunks.

[jhmaindonald]

A further note. What I identified as an RStudio issue (the initial
reason for the 4 spaces) arose because I'd accidentally
created an uncompleted code line in an earlier code chunk.

[yihui]

should be fixed now; thanks!

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