How do I adjust the position attributes of custom Eclipse markers when a file is edited by typing?

Question

Does Eclipse adjust the position attributes of custom markers when a file is edited?

I have many Eclipse plugins in which I successfully create and delete markers, create quick fixes, and apply edits to the active editor programmatically. When text is inserted or deleted from the buffer all the text in the editor shifts, of course, and Eclipse's markers and my custom markers stay in synch with the text.

The problem is that when the file is edited, whether by regular typing or programmatically by changing the IBuffer, the attributes (e.g. CHAR_START) are not modified - they report the values when the marker was created and first made visible. So when one goes to do a QuickFix on the marker, for example, the reported position is incorrect. (This is an info marker, in CDT, if that matters.)

How are these marker positions supposed to be updated when edits happen? Is there an Eclipse way to do this, but I need to implement some setting or notification or listener?

One possibility is to implement a ResourceChangeReporter - but it is not triggered for me when text edits happen, just when, for example, a save is invoked. And, if it were, I don't see information about how the file is actually altered.

I suppose I could require that a dirty file be saved before the quick fix is applied, but I still don't see where to obtain information about the file's edits. If I apply the edit programmatically, I know this information, but it does not help when the edit happens by typing.

Answer 1

Marker positions can be updated during editing using an updater declared using the org.eclipse.ui.editors.markerUpdaters extension point and implementing the IMarkerUpdater interface.

However there is a default updater org.eclipse.ui.texteditor.BasicMarkerUpdater which is already active for all markers which should be doing basic position updating for you.