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https://issues.apache.org/jira/browse/UIMA-2273?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13146239#comment-13146239
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Joern Kottmann commented on UIMA-2273:
--------------------------------------

There seem to be quite some issues with this change. I updated all the actions 
to not "cache" the document instance. It is safe to bind everything against the 
editor and then ask it for the current document.
I will now go once more through all the views and check if any document 
instance is cached.

Anyway I didn't know of this issue either until it came up during testing.

Well, with every change you do on the Cas Editor you will learn the code a bit 
better, and I can help you and review all the changes. So there is really no 
need to worry doing a change, because it could break something.
                
> Let CAS Editor implement IResourceChangeListener
> ------------------------------------------------
>
>                 Key: UIMA-2273
>                 URL: https://issues.apache.org/jira/browse/UIMA-2273
>             Project: UIMA
>          Issue Type: New Feature
>          Components: CasEditor
>    Affects Versions: 2.4.0SDK
>            Reporter: Peter Klügl
>            Assignee: Peter Klügl
>            Priority: Minor
>             Fix For: 2.4.0SDK
>
>
> Some functionality to automatically update a opened CAS in the CAS editor if 
> the file was changed would be really nice. I don't know for sure, if this 
> functionality is missing or I simply didn't find it in the code and in 
> Eclipse. In any case, I haven't found a IResourceChangeListener 
> implementation and that is how I would have done it.
> The general communication shouldn't be a problem to implement, but - in my 
> experience - updating all necessary elements can be tricky. The interface for 
> changing a view can maybe be used and has probably to be extended.

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