Move empty document range at EOF to start of removed range

Fixes #3380

Author: danthe1st

bundles/org.eclipse.text/projection/org/eclipse/jface/text/projection/ProjectionDocument.java

@@ -417,6 +417,9 @@ private void internalRemoveMasterDocumentRange(int offsetInMaster, int lengthInM
 			if (fragment.getOffset() == offsetInMaster) {
 				fragment.setOffset(offsetInMaster + lengthInMaster);
 				fragment.setLength(fragment.getLength() - lengthInMaster);
+				if(fragment.getLength() == 0 && offsetInMaster != 0 && offsetInMaster + lengthInMaster == getMasterDocument().getLength()) {
+					fragment.setOffset(offsetInMaster);
+				}
 			} else {
 				// split fragment into three fragments, let position updater remove it