`ess-r-package--find-package-name`: Maximum buffer size exceeded

[wenjie2wang]

It seems that there is an edge case where ess-r-package--find-package-name fails and returns Maximum buffer size exceeded.

To reproduce this issue with ESS enabled:

1. create a new directory named description under some folder, say ~/foo/
2. run M-x shell and change the directory by cd ~/foo
3. run C-x C-f or M-x, etc. under the directory ~/foo

The echo area would show "Maximum buffer size exceeded" and prevent any further action. I tested that the error occurs on MacOS. For Linux machines, the directory has to be named in uppercase (DESCRIPTION) to trigger the error.

It is a minor issue and can be avoided by removing/renaming the directory. It would be great if it could be fixed though.