Plugin can't initialize in multi-user setup

Upon startup, I’m getting:

Plugin 'com.vladsch.idea.multimarkdown' failed to initialize and will be disabled.  Please restart RubyMine.

java.lang.ExceptionInInitializerError
...
Caused by: com.intellij.diagnostic.PluginException: /tmp/multimarkdown_taskitems.ttf (Permission denied) [Plugin: com.vladsch.idea.multimarkdown]
    ... 59 more
Caused by: java.io.FileNotFoundException: /tmp/multimarkdown_taskitems.ttf (Permission denied)

Sure enough, file /tmp/multimarkdown_taskitems.ttf exists and is owned by another user with 644 rights. Since the current user should thereby be allowed to read, I’m guessing the plugin tries to write the file without checking for existence, which is then denied.

Please fix by adhering to “tmp hygiene” standards: use a session-/user-unique folder for all things (e.g. File.createTempDirectory).

FWIW, under GNU/Linux, a cache folder in the home directory may be the ideal solution, e.g. via XDG_CACHE_HOME (available on many modern distributions, afaik). It’s probably a pain to get it to work in every scenario, and I don’t know if there’s a good Java wrapper for those things, so I feel for you.

Related, but old so I don’t think fixes apply: #87, #95

[vsch]

@reitzig, now temp files are always put into user’s home directory under .markdownNavigator subdirectory.

[vsch]

@reitzig, I add a temp folder under the user directory. I agree that this is a more portable solution.

Another option is to use an embedded web server to eliminate the need for file URIs to the file system.