Hello, This patch allows preview.el to work in LaTeX-mode non-file buffers for which TeX-master has been set to the name of a valid tex file.
This patch might appear to be adding a new feature, but if I understand correctly, it's really fixing an ancient bug. From what I can tell, preview.el was carefully designed to support non-file buffers, but this support was broken unintentionally in the commit 3651776f5a57283f97af54a53a6106519bef41b0. In more detail, when preview-region is called on a non-file buffer, the file name "<none>" is passed along to TeX-region-create. Since that commit, the file name is subsequently relativized to the master file, even when it is "<none>". As a result, in preview-parse-messages, the checks (string= file "<none>") fail in cases where they should succeed. This patch makes it so that TeX-region-create only relativizes the file name when it is not equal to "<none>", so that the checks in question succeed, as was intended. As motivation, I have been using something equivalent to this patch for a while, and have found it very useful in, e.g., indirect org-mode source blocks. Thanks, best, Paul
0001-Allow-preview-to-work-in-non-file-buffers.patch
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