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This is a second part of the problem originally described in the issue 64533. Even though the construction of annotation bar is now done in a worker thread and does not prevent the user from interaction with editor, it can take quite a long time. This should be made faster. Please, don't close this issue only because you don't know how to speedup the offset->Line conversion. This should be solved somehow! Perhaps something better than Line has to be made Annotatable, or some other kind of redesign is needed...
I do not plan to workaround this performance issue in javacvs. Tonda have you reported it against editor, too? I'd add dependency.
I have created issue 65162 to request creation of offset-range Annotatable in openide/editor.
*** This issue has been marked as a duplicate of 59721 ***