SharpDevelop doesn't notice file attribute changes

[dgrunwald]

SD-1783, originally created on 12/2/2010 12:22:55 by Eusebiu Marcu

see http://community.sharpdevelop.net/forums/t/12336.aspx

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Comment from Daniel Grunwald on 8/16/2011 14:29:23:
Eusebiu attempted a fix, but I had to revert it again (in commit
793e357).

The difficulty here is that there is one FileSystemWatcher per
OpenedFile, but the read-only icon is controlled by the individual view
contents. Eusebiu tried to do the notification using event handlers, but
this is prone to memory leaks as the OpenedFile may have a longer
lifetime than the view contents.

Also, file deletions can be troublesome, as many programs temporarily
delete the file, and then recreate it immediately. SharpDevelop must
ignore deletions without crashing.