fixes bug 45700: Java editing with line number causes unwanted selections...

org.eclipse.jface.text/src/org/eclipse/jface/text/source/LineNumberRulerColumn.java

diff --git a/org.eclipse.jface.text/src/org/eclipse/jface/text/source/LineNumberRulerColumn.java b/org.eclipse.jface.text/src/org/eclipse/jface/text/source/LineNumberRulerColumn.java
index e32dd1f..1c5fc76 100644
--- a/org.eclipse.jface.text/src/org/eclipse/jface/text/source/LineNumberRulerColumn.java
+++ b/org.eclipse.jface.text/src/org/eclipse/jface/text/source/LineNumberRulerColumn.java
@@ -103,8 +103,11 @@
 		 * @see org.eclipse.swt.events.MouseListener#mouseUp(org.eclipse.swt.events.MouseEvent)
 		 */
 		public void mouseUp(MouseEvent event) {
-			stopSelecting();
-			stopAutoScroll();
+			// see bug 45700
+			if (event.button == 1) {
+				stopSelecting();
+				stopAutoScroll();
+			}
 		}
 		
 		/*
@@ -112,7 +115,10 @@
 		 */
 		public void mouseDown(MouseEvent event) {
 			fParentRuler.setLocationOfLastMouseButtonActivity(event.x, event.y);
-			startSelecting();
+			// see bug 45700
+			if (event.button == 1) {
+				startSelecting();
+			}
 		}
 		
 		/*