According to the coding standards we must use Unix line terminators https://www.drupal.org/docs/develop/standards/coding-standards#indenting →
Several files in the module make use of CRLF and need to be changed.
find . -type f | xargs file | grep "CRLF line terminators"
# List of files affected
find . -type f -exec dos2unix {} \;
Steps to avoid this: https://www.drupal.org/documentation/git/configure →
Closed: outdated
1.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
I've volunteered to help clean up the FullCalendar issue queue. As part of that effort I'm closing issues open for unsupported versions of the module as "Closed (outdated)".
If this issue is still relevant for version 3.x of FullCalendar, then feel free to re-open it and update the issue version number.