bug 644413 added support of loading the right context if a mode line is present. But this mode line has to be added manually right now which makes this feature completely invisible. Existing developers will never know of this feature and new ones will not remember to add the mode-line manually, leaving apart remembering the correct syntax of mode-line. What actually should be done is to add the mode-line itself upon saving the file. This way, the dev will not have to do extra work, and when he reopens the file next time, correct context would be chosen automatically.
Inactive for the past 5 years. Closing now.