Don't mark file as modified if plugin can't do it

Feature Requests item #2943137, was opened at 2010-01-31 12:47
Message generated for change (Tracker Item Submitted) made by annulen
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Category: Commands / Extensions
Group: v 1.2.0
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Konstantin Tokarev (annulen)
Assigned to: Nobody/Anonymous (nobody)
Summary: Don’t mark file as modified if plugin can’t do it

Initial Comment:
For instance, plugin “Vibrations” can’t modify molecule, but when calling it, file is marked as modified. Plugin returns null as undo action, so undo stack remains empty. However, some plugins with null return can actually modify molecule, so empty undo can’t be used to distinguish groups of plugins.

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