Fix intermittent crashing under Unix. Closes #25

Something goes wrong with the view cursor, when inserting RTF text after
adding additional paragraph end characters to prevent styling changes
so we have to fiddle around with it to prevent crashing.

build/source/org/zotero/integration/ooo/comp/Document.java

@@ -429,7 +429,7 @@ public void setBibliographyStyle(int firstLineIndent, int bodyIndent, int lineSp
 		// this takes less than half as many lines in py-appscript!
 	}
 
-	XTextViewCursor getSelection() {
+	public XTextViewCursor getSelection() {
 		XTextViewCursorSupplier supplier = (XTextViewCursorSupplier) UnoRuntime.queryInterface(XTextViewCursorSupplier.class, controller);
 		return supplier.getViewCursor();
 	}

build/source/org/zotero/integration/ooo/comp/ReferenceMark.java

@@ -149,6 +149,7 @@ public String getText() throws Exception {
 
 	public void setText(String textString, boolean isRich) throws Exception {
 		boolean isBibliography = getCode().startsWith("BIBL");
+		XTextCursor viewCursor = doc.getSelection();
 
 		if(isBibliography) {
 			prepareMultiline();
@@ -169,6 +170,11 @@ public void setText(String textString, boolean isRich) throws Exception {
 				text.insertControlCharacter(range, ControlCharacter.PARAGRAPH_BREAK, false);
 				text.insertControlCharacter(range.getEnd(), ControlCharacter.PARAGRAPH_BREAK, false);
 				cursor.collapseToStart();
+				// LibreOffice crashes here if we don't move the viewCursor.
+				// Affects Ubuntu and maybe MacOS.
+				// Don't ask me why it crashes though. 
+				viewCursor.gotoRange((XTextRange) cursor, false);
+				viewCursor.goLeft((short)1, false);
 				moveCursorRight(cursor, previousLen);
 			}
 		}
@@ -248,6 +254,10 @@ public void setText(String textString, boolean isRich) throws Exception {
 				if(str.equals("\n") || str.equals("\r\n")) {
 					dupRange.setString("");
 				}
+
+				// Restoring cursor position
+				viewCursor.gotoRange(dupRange, false);
+				viewCursor.collapseToEnd();
 
 				dupRange = text.createTextCursorByRange(range);
 				dupRange.collapseToStart();