nnimap.el (nnimap-wait-for-response): Ensure that we get the entire line we're waitin...

nnimap.el (nnimap-wait-for-response): Ensure that we get the entire line we're waiting for.
gnus-art.el (gnus-article-next-page-1): Because customized mode-line face with line-width greater than zero will cause RET in gnus summary buffer to scroll down article page-wise because auto vscroll happens, it should be temporalily disabled when doing a scroll-up.