validate version control status after buffer save or save-as

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@35796 a592a061-630c-0410-9148-cb99ea01b6c8

src/LyXVC.cpp

@@ -68,6 +68,7 @@ bool LyXVC::file_found_hook(FileName const & fn)
 	}
 
 	// file is not under any VCS.
+	vcs.reset(0);
 	return false;
 }
 

src/frontends/qt4/GuiView.cpp

@@ -2280,6 +2280,10 @@ bool GuiView::saveBuffer(Buffer & b)
 
 	if (b.save()) {
 		theSession().lastFiles().add(b.fileName());
+		// validate version control data and
+		// correct buffer title
+		b.lyxvc().file_found_hook(b.fileName());
+		b.updateTitles();
 		return true;
 	}