Fix Bug 365311: Styles were not sent for lines whose styling became e…

…mpty after an edit

https://bugs.eclipse.org/bugs/show_bug.cgi?id=365331

lib/highlighter.js

@@ -332,32 +332,33 @@ define(["CodeMirror", "orion/textview/eventTarget"], function(mMirror, mEventTar
 		sendStyle: function() {
 			var start = this.redrawStart, end = this.redrawEnd;
 			if (start < Number.MAX_VALUE && end > -1) {
-				var style = {}, isStyleChange = false;
+				var style = {};
 				for (var i=start; i <= end; i++) {
 					var lineIndex = i, line = this.lines[lineIndex];
 					var rangesErrors = line && this.styleToRangesErrors(line.style);
 					if (rangesErrors) {
 						var ranges = rangesErrors[0], errors = rangesErrors[1];
-						var obj = {};
+						var obj = {}, hasAnything = false;
 						if (ranges && ranges.length) {
 							obj.ranges = ranges;
-							isStyleChange = true;
 							style[i] = obj;
+							hasAnything = true;
 						}
 						if (errors && errors.length) {
 							obj.errors = errors;
-							isStyleChange = true;
 							style[i] = obj;
+							hasAnything = true;
+						}
+						if (!hasAnything) {
+							style[i] = null;
 						}
 					}
 				}
-				if (isStyleChange) {
-					var event = {
-						type: "StyleReady",
-						style: style
-					};
-					this.dispatchEvent(event);
-				}
+				var event = {
+					type: "StyleReady",
+					style: style
+				};
+				this.dispatchEvent(event);
 			}
 			//console.debug("Fired " + (end - start) + " lines [" + start + ".." + end + "]");
 			this.redrawStart = Number.MAX_VALUE;