rmap.connect('files_diff_2way_home', '/{repo_name:.*?}/diff-2way/{f_path:.*}',

                controller='files', action='diff_2way', revision='tip', f_path='',

                conditions=dict(function=check_repo))

from rhodecode.lib.compat import OrderedDict, json

    @LoginRequired()

    @HasRepoPermissionAnyDecorator('repository.read', 'repository.write',

                                   'repository.admin')

    def diff_2way(self, repo_name, f_path):

        diff1 = request.GET.get('diff1', '')

        diff2 = request.GET.get('diff2', '')

        try:

            if diff1 not in ['', None, 'None', '0' * 12, '0' * 40]:

                c.changeset_1 = c.rhodecode_repo.get_changeset(diff1)

                try:

                    node1 = c.changeset_1.get_node(f_path)

                    if node1.is_dir():

                        raise NodeError('%s path is a %s not a file'

                                        % (node1, type(node1)))

                except NodeDoesNotExistError:

                    c.changeset_1 = EmptyChangeset(cs=diff1,

                                                   revision=c.changeset_1.revision,

                                                   repo=c.rhodecode_repo)

                    node1 = FileNode(f_path, '', changeset=c.changeset_1)

            else:

                c.changeset_1 = EmptyChangeset(repo=c.rhodecode_repo)

                node1 = FileNode(f_path, '', changeset=c.changeset_1)

            if diff2 not in ['', None, 'None', '0' * 12, '0' * 40]:

                c.changeset_2 = c.rhodecode_repo.get_changeset(diff2)

                try:

                    node2 = c.changeset_2.get_node(f_path)

                    if node2.is_dir():

                        raise NodeError('%s path is a %s not a file'

                                        % (node2, type(node2)))

                except NodeDoesNotExistError:

                    c.changeset_2 = EmptyChangeset(cs=diff2,

                                                   revision=c.changeset_2.revision,

                                                   repo=c.rhodecode_repo)

                    node2 = FileNode(f_path, '', changeset=c.changeset_2)

            else:

                c.changeset_2 = EmptyChangeset(repo=c.rhodecode_repo)

                node2 = FileNode(f_path, '', changeset=c.changeset_2)

        except (RepositoryError, NodeError):

            log.error(traceback.format_exc())

            return redirect(url('files_home', repo_name=c.repo_name,

                                f_path=f_path))

        if node2.is_binary:

            node2_content = 'binary file'

        else:

            node2_content = node2.content

        if node1.is_binary:

            node1_content = 'binary file'

        else:

            node1_content = node1.content

        html_escape_table = {

            "&": "\u0026",

            '"': "\u0022",

            "'": "\u0027",

            ">": "\u003e",

            "<": "\<",

            '\\': "\u005c",

            '\n': '\\n'

        }

        c.orig1 = h.html_escape((node1_content), html_escape_table)

        c.orig2 = h.html_escape((node2_content), html_escape_table)

        c.node1 = node1

        c.node2 = node2

        c.cs1 = c.changeset_1

        c.cs2 = c.changeset_2

        return render('files/diff_2way.html')

def html_escape(text, html_escape_table=None):

    """Produce entities within text."""

    if not html_escape_table:

/* required */

.mergely-column textarea { width: 80px; height: 200px; }

.mergely-column { float: left; }

.mergely-margin { float: left; }

.mergely-canvas { float: left; width: 28px; }

/* resizeable */

.mergely-resizer { width: 100%; height: 100%; }

/* style configuration */

.mergely-column { border: 1px solid #ccc; }

.mergely-active { border: 1px solid #a3d1ff; }

.mergely.a.rhs.start { border-top: 1px solid #ddffdd; }

.mergely.a.lhs.start.end,

.mergely.a.rhs.end { border-bottom: 1px solid #ddffdd; }

.mergely.a.rhs { background-color: #ddffdd; }

.mergely.a.lhs.start.end.first { border-bottom: 0; border-top: 1px solid #ddffdd; }

.mergely.d.lhs { background-color: #edc0c0; }

.mergely.d.lhs.end,

.mergely.d.rhs.start.end { border-bottom: 1px solid #ffdddd; }

.mergely.d.rhs.start.end.first { border-bottom: 0; border-top: 1px solid #ffdddd; }

.mergely.d.lhs.start { border-top: 1px solid #ffdddd; }

.mergely.c.lhs,

.mergely.c.rhs { background-color: #fafafa; }

.mergely.c.lhs.start,

.mergely.c.rhs.start { border-top: 1px solid #a3a3a3; }

.mergely.c.lhs.end,

.mergely.c.rhs.end { border-bottom: 1px solid #a3a3a3; }

.mergely.ch.a.rhs { background-color: #ddffdd; }

.mergely.ch.d.lhs { background-color: #ffdddd; }

.mergely-margin #compare-lhs-margin,

.mergely-margin #compare-rhs-margin{

    cursor: pointer

}

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Mgly = {};

Mgly.Timer = function(){

	var self = this;

	self.start = function() { self.t0 = new Date().getTime(); }

	self.stop = function() {

		var t1 = new Date().getTime();

		var d = t1 - self.t0;

		self.t0 = t1;

		return d;

	}

	self.start();

}

Mgly.ChangeExpression = new RegExp(/(\d+(?:,\d+)?)([acd])(\d+(?:,\d+)?)/);

Mgly.DiffParser = function(diff) {

	var changes = [];

	var change_id = 0;

	// parse diff

	var diff_lines = diff.split(/\n/);

	for (var i = 0; i < diff_lines.length; ++i) {

		if (diff_lines[i].length == 0) continue;

		var change = {};

		var test = Mgly.ChangeExpression.exec(diff_lines[i]);

		if (test == null) continue;

		// lines are zero-based

		var fr = test[1].split(',');

		change['lhs-line-from'] = fr[0] - 1;

		if (fr.length == 1) change['lhs-line-to'] = fr[0] - 1;

		else change['lhs-line-to'] = fr[1] - 1;

		var to = test[3].split(',');

		change['rhs-line-from'] = to[0] - 1;

		if (to.length == 1) change['rhs-line-to'] = to[0] - 1;

		else change['rhs-line-to'] = to[1] - 1;

		change['op'] = test[2];

		changes[change_id++] = change;

	}

	return changes;

}

Mgly.sizeOf = function(obj) {

	var size = 0, key;

	for (key in obj) {

		if (obj.hasOwnProperty(key)) size++;

	}

	return size;

}

Mgly.LCS = function(x, y) {

	this.x = x.replace(/[ ]{1}/g, '\n');

	this.y = y.replace(/[ ]{1}/g, '\n');

}

jQuery.extend(Mgly.LCS.prototype, {

	clear: function() { this.ready = 0; },

	diff: function(added, removed) {

		var d = new Mgly.diff(this.x, this.y, retain_lines = true, ignore_ws = false);

		var changes = Mgly.DiffParser(d.normal_form());

		var li = 0, lj = 0;

		for (var i = 0; i < changes.length; ++i) {

			var change = changes[i];

			if (change.op != 'a') {

				// find the starting index of the line

				li = d.lhs_lines.slice(0, change['lhs-line-from']).join(' ').length;

				// get the index of the the span of the change

				lj = change['lhs-line-to'] + 1;

				// get the changed text

				var lchange = d.lhs_lines.slice(change['lhs-line-from'], lj).join(' ');

				if (change.op == 'd') lchange += ' ';// include the leading space

				else if (li > 0 && change.op == 'c') li += 1; // ignore leading space if not first word

				// output the changed index and text

				removed(li, li + lchange.length);

			}

			if (change.op != 'd') {

				// find the starting index of the line

				li = d.rhs_lines.slice(0, change['rhs-line-from']).join(' ').length;

				// get the index of the the span of the change

				lj = change['rhs-line-to'] + 1;

				// get the changed text

				var rchange = d.rhs_lines.slice(change['rhs-line-from'], lj).join(' ');

				if (change.op == 'a') rchange += ' ';// include the leading space

				else if (li > 0 && change.op == 'c') li += 1; // ignore leading space if not first word

				// output the changed index and text

				added(li, li + rchange.length);

			}

		}

	}

});

Mgly.diff = function(lhs, rhs, retain_lines, ignore_ws) {

	this.diff_codes = {};

	this.max_code = 0;

	var lhs_lines = lhs.split('\n');

	var rhs_lines = rhs.split('\n');

	if (lhs.length == 0) lhs_lines = [];

	if (rhs.length == 0) rhs_lines = [];

	var lhs_data = new Object();

	lhs_data.data = this._diff_codes(lhs_lines, ignore_ws);

	lhs_data.modified = {};

	lhs_data.length = Mgly.sizeOf(lhs_data.data);

	var rhs_data = new Object();

	rhs_data.data = this._diff_codes(rhs_lines, ignore_ws);

	rhs_data.modified = {};

	rhs_data.length = Mgly.sizeOf(rhs_data.data);

	var max = (lhs_data.length + rhs_data.length + 1);

	var vector_d = Array( 2 * max + 2 );

	var vector_u = Array( 2 * max + 2 );

	this._lcs(lhs_data, 0, lhs_data.length, rhs_data, 0, rhs_data.length, vector_u, vector_d);

	this._optimize(lhs_data);

	this._optimize(rhs_data);

	this.items = this._create_diffs(lhs_data, rhs_data);

	if (retain_lines) {

		this.lhs_lines = lhs_lines;

		this.rhs_lines = rhs_lines;

	}

};

jQuery.extend(Mgly.diff.prototype, {

	changes: function() { return this.items; },

	normal_form: function() {

		var nf = '';

		for (var index = 0; index < this.items.length; ++index) {

			var item = this.items[index];

			var lhs_str = '';

			var rhs_str = '';

			var change = 'c';

			if (item.lhs_deleted_count == 0 && item.rhs_inserted_count > 0) change = 'a';

			else if (item.lhs_deleted_count > 0 && item.rhs_inserted_count == 0) change = 'd';

			if (item.lhs_deleted_count == 1) lhs_str = item.lhs_start + 1;

			else if (item.lhs_deleted_count == 0) lhs_str = item.lhs_start;

			else lhs_str = (item.lhs_start + 1) + ',' + (item.lhs_start + item.lhs_deleted_count);

			if (item.rhs_inserted_count == 1) rhs_str = item.rhs_start + 1;

			else if (item.rhs_inserted_count == 0) rhs_str = item.rhs_start;

			else rhs_str = (item.rhs_start + 1) + ',' + (item.rhs_start + item.rhs_inserted_count);

			nf += lhs_str + change + rhs_str + '\n';

			if (this.rhs_lines && this.lhs_lines) {

				// if rhs/lhs lines have been retained, output contextual diff

				for (var i = item.lhs_start; i < item.lhs_start + item.lhs_deleted_count; ++i) {

					nf += '< ' + this.lhs_lines[i] + '\n';

				}

				if (item.rhs_inserted_count && item.lhs_deleted_count) nf += '---\n';

				for (var i = item.rhs_start; i < item.rhs_start + item.rhs_inserted_count; ++i) {

					nf += '> ' + this.rhs_lines[i] + '\n';

				}

			}

		}

		return nf;

	},

	_diff_codes: function(lines, ignore_ws) {

		var code = this.max_code;

		var codes = {};

		for (var i = 0; i < lines.length; ++i) {

			var line = lines[i];

			if (ignore_ws) {

				line = line.replace(/\s+/g, '');

			}

			var aCode = this.diff_codes[line];

			if (aCode != undefined) {

				codes[i] = aCode;

			}

			else {

				this.max_code++;

				this.diff_codes[line] = this.max_code;

				codes[i] = this.max_code;

			}

		}

		return codes;

	},

	_lcs: function(lhs, lhs_lower, lhs_upper, rhs, rhs_lower, rhs_upper, vector_u, vector_d) {

		while ( (lhs_lower < lhs_upper) && (rhs_lower < rhs_upper) && (lhs.data[lhs_lower] == rhs.data[rhs_lower]) ) {

			++lhs_lower;

			++rhs_lower;

		}

		while ( (lhs_lower < lhs_upper) && (rhs_lower < rhs_upper) && (lhs.data[lhs_upper - 1] == rhs.data[rhs_upper - 1]) ) {

			--lhs_upper;

			--rhs_upper;

		}

		if (lhs_lower == lhs_upper) {

			while (rhs_lower < rhs_upper) {

				rhs.modified[ rhs_lower++ ] = true;

			}

		}

		else if (rhs_lower == rhs_upper) {

			while (lhs_lower < lhs_upper) {

				lhs.modified[ lhs_lower++ ] = true;

			}

		}

		else {

			var sms = this._sms(lhs, lhs_lower, lhs_upper, rhs, rhs_lower, rhs_upper, vector_u, vector_d);

			this._lcs(lhs, lhs_lower, sms.x, rhs, rhs_lower, sms.y, vector_u, vector_d);

			this._lcs(lhs, sms.x, lhs_upper, rhs, sms.y, rhs_upper, vector_u, vector_d);

		}

	},

	_sms: function(lhs, lhs_lower, lhs_upper, rhs, rhs_lower, rhs_upper, vector_u, vector_d) {

		var max = lhs.length + rhs.length + 1;

		var kdown = lhs_lower - rhs_lower;

		var kup = lhs_upper - rhs_upper;

		var delta = (lhs_upper - lhs_lower) - (rhs_upper - rhs_lower);

		var odd = (delta & 1) != 0;

		var offset_down = max - kdown;

		var offset_up = max - kup;

		var maxd = ((lhs_upper - lhs_lower + rhs_upper - rhs_lower) / 2) + 1;

		vector_d[ offset_down + kdown + 1 ] = lhs_lower;

		vector_u[ offset_up + kup - 1 ] = lhs_upper;

		var ret = {x:0,y:0};

		for (var d = 0; d <= maxd; ++d) {

			for (var k = kdown - d; k <= kdown + d; k += 2) {

				var x, y;

				if (k == kdown - d) {

					x = vector_d[ offset_down + k + 1 ];//down

				}

				else {

					x = vector_d[ offset_down + k - 1 ] + 1;//right

					if ((k < (kdown + d)) && (vector_d[ offset_down + k + 1 ] >= x)) {

						x = vector_d[ offset_down + k + 1 ];//down

					}

				}

				y = x - k;

				// find the end of the furthest reaching forward D-path in diagonal k.

				while ((x < lhs_upper) && (y < rhs_upper) && (lhs.data[x] == rhs.data[y])) {

					x++; y++;

				}

				vector_d[ offset_down + k ] = x;

				// overlap ?

				if (odd && (kup - d < k) && (k < kup + d)) {

					if (vector_u[offset_up + k] <= vector_d[offset_down + k]) {

						ret.x = vector_d[offset_down + k];

						ret.y = vector_d[offset_down + k] - k;

						return (ret);

					}

				}

			}

			// Extend the reverse path.

			for (var k = kup - d; k <= kup + d; k += 2) {

				// find the only or better starting point

				var x, y;

				if (k == kup + d) {

					x = vector_u[offset_up + k - 1]; // up

				} else {

					x = vector_u[offset_up + k + 1] - 1; // left

					if ((k > kup - d) && (vector_u[offset_up + k - 1] < x))

						x = vector_u[offset_up + k - 1]; // up

				}

				y = x - k;

				while ((x > lhs_lower) && (y > rhs_lower) && (lhs.data[x - 1] == rhs.data[y - 1])) {

					// diagonal

					x--;

					y--;

				}

				vector_u[offset_up + k] = x;

				// overlap ?

				if (!odd && (kdown - d <= k) && (k <= kdown + d)) {

					if (vector_u[offset_up + k] <= vector_d[offset_down + k]) {

						ret.x = vector_d[offset_down + k];

						ret.y = vector_d[offset_down + k] - k;

						return (ret);

					}

				}

			}

		}

		throw "the algorithm should never come here.";

	},

	_optimize: function(data) {

		var start = 0, end = 0;

		while (start < data.length) {

			while ((start < data.length) && (data.modified[start] == undefined || data.modified[start] == false)) {

				start++;

			}

			end = start;

			while ((end < data.length) && (data.modified[end] == true)) {

				end++;

			}

			if ((end < data.length) && (data.data[start] == data.data[end])) {

				data.modified[start] = false;

				data.modified[end] = true;

			}

			else {

				start = end;

			}

		}

	},

	_create_diffs: function(lhs_data, rhs_data) {

		var items = [];

		var lhs_start = 0, rhs_start = 0;

		var lhs_line = 0, rhs_line = 0;

		while (lhs_line < lhs_data.length || rhs_line < rhs_data.length) {

			if ((lhs_line < lhs_data.length) && (!lhs_data.modified[lhs_line])

				&& (rhs_line < rhs_data.length) && (!rhs_data.modified[rhs_line])) {

				// equal lines

				lhs_line++;

				rhs_line++;

			}

			else {

				// maybe deleted and/or inserted lines

				lhs_start = lhs_line;

				rhs_start = rhs_line;

				while (lhs_line < lhs_data.length && (rhs_line >= rhs_data.length || lhs_data.modified[lhs_line]))

					lhs_line++;

				while (rhs_line < rhs_data.length && (lhs_line >= lhs_data.length || rhs_data.modified[rhs_line]))

					rhs_line++;

				if ((lhs_start < lhs_line) || (rhs_start < rhs_line)) {

					// store a new difference-item

					var aItem = new Object();

					aItem.lhs_start = lhs_start;

					aItem.rhs_start = rhs_start;

					aItem.lhs_deleted_count = lhs_line - lhs_start;

					aItem.rhs_inserted_count = rhs_line - rhs_start;

					items.push(aItem);

				}

			}

		}

		return items;

	}

});

Mgly.mergely = function(el, options) {

	CodeMirror.defineExtension('centerOnCursor', function() {

		var coords = this.cursorCoords(null, 'local');

		this.scrollTo(null,

			(coords.y + coords.yBot) / 2 - (this.getScrollerElement().clientHeight / 2));

	});

	if (el) {

		this.init(el, options);

	}

};

jQuery.extend(Mgly.mergely.prototype, {

	name: 'mergely',

	//http://jupiterjs.com/news/writing-the-perfect-jquery-plugin

	init: function(el, options) {

		this.settings = {

			autoupdate: true,

			autoresize: true,

			rhs_margin: 'right',

			lcs: true,

			sidebar: true,

			viewport: false,

			ignorews: false,

			fadein: 'fast',

			editor_width: '400px',

			editor_height: '400px',

			resize_timeout: 500,

			change_timeout: 150,

			fgcolor: {a:'#4ba3fa',c:'#a3a3a3',d:'#ff7f7f'},

			bgcolor: '#eee',

			vpcolor: 'rgba(0, 0, 200, 0.2)',

			lhs: function(setValue) { },

			rhs: function(setValue) { },

			loaded: function() { },

			//_auto_height: function(h) { return h - 20; },

			_auto_width: function(w) { return w; },

			resize: function(init) {

				var scrollbar = init ? -15 : 0;

				var w = jQuery(el).parent().width() + scrollbar;

				if (this.width == 'auto') {

					w = this._auto_width(w);

				}

				else {

					w = this.width;

					this.editor_width = w;

				}

				if (this.height == 'auto') {

					//h = this._auto_height(h);

					h = jQuery(el).parent().height();

				}

				else {

					h = this.height;

					this.editor_height = h;

				}

				var content_width = w / 2.0 - 2 * 8 - 8;

				var content_height = h;

				var self = jQuery(el);

				self.find('.mergely-column').css({ width: content_width + 'px' });

				self.find('.mergely-column, .mergely-canvas, .mergely-margin, .mergely-column textarea, .CodeMirror-scroll, .cm-s-default').css({ height: content_height + 'px' });

				self.find('.mergely-canvas').css({ height: content_height + 'px' });

				self.find('.mergely-column textarea').css({ width: content_width + 'px' });

				self.css({ width: w, height: h, clear: 'both' });

				if (self.css('display') == 'none') {

					if (this.fadein != false) self.fadeIn(this.fadein);

					else self.show();

					if (this.loaded) this.loaded();

				}

				if (this.resized) this.resized();

			},

			_debug: '', //scroll,draw,calc,diff,markup,change

			resized: function() { }

		};

		var cmsettings = {

			mode: 'text/plain',

			readOnly: false,

			lineWrapping: false,

			lineNumbers: true,

			gutters: ['merge', 'CodeMirror-linenumbers']

		}

		this.lhs_cmsettings = {};

		this.rhs_cmsettings = {};

		// save this element for faster queries

		this.element = jQuery(el);

		// save options if there are any

		if (options && options.cmsettings) jQuery.extend(this.lhs_cmsettings, cmsettings, options.cmsettings, options.lhs_cmsettings);

		if (options && options.cmsettings) jQuery.extend(this.rhs_cmsettings, cmsettings, options.cmsettings, options.rhs_cmsettings);

		if (options) jQuery.extend(this.settings, options);

		// bind if the element is destroyed

		this.element.bind('destroyed', jQuery.proxy(this.teardown, this));

		// save this instance in jQuery data

		jQuery.data(el, this.name, this);

		this._setup(el);

	},

	// bind events to this instance's methods

	bind: function() {

		var rhstx = jQuery('#' + this.id + '-rhs').get(0);

		if (!rhstx) {

			console.error('rhs textarea not defined - Mergely not initialized properly');

			return;

		}

		var lhstx = jQuery('#' + this.id + '-lhs').get(0);

		if (!rhstx) {

			console.error('lhs textarea not defined - Mergely not initialized properly');

			return;

		}

		var self = this;

		this.editor = [];

		this.editor[this.id + '-lhs'] = CodeMirror.fromTextArea(lhstx, this.lhs_cmsettings);

		this.editor[this.id + '-rhs'] = CodeMirror.fromTextArea(rhstx, this.rhs_cmsettings);

		this.editor[this.id + '-lhs'].on('change', function(){ if (self.settings.autoupdate) self._changing(self.id + '-lhs', self.id + '-rhs'); });

		this.editor[this.id + '-lhs'].on('scroll', function(){ self._scrolling(self.id + '-lhs'); });

		this.editor[this.id + '-rhs'].on('change', function(){ if (self.settings.autoupdate) self._changing(self.id + '-lhs', self.id + '-rhs'); });

		this.editor[this.id + '-rhs'].on('scroll', function(){ self._scrolling(self.id + '-rhs'); });

		// resize

		if (this.settings.autoresize) {

			var sz_timeout1 = null;

			var sz = function(init) {

				//self.em_height = null; //recalculate

				if (self.settings.resize) self.settings.resize(init);

				self.editor[self.id + '-lhs'].refresh();

				self.editor[self.id + '-rhs'].refresh();

				if (self.settings.autoupdate) {

					self._changing(self.id + '-lhs', self.id + '-rhs');

				}

			}

			jQuery(window).resize(

				function () {

					if (sz_timeout1) clearTimeout(sz_timeout1);

					sz_timeout1 = setTimeout(sz, self.settings.resize_timeout);

				}

			);

			sz(true);

		}

	},

	unbind: function() {

		if (this.changed_timeout != null) clearTimeout(this.changed_timeout);

		this.editor[this.id + '-lhs'].toTextArea();

		this.editor[this.id + '-rhs'].toTextArea();

	},

	destroy: function() {

		this.element.unbind('destroyed', this.teardown);

		this.teardown();

	},

	teardown: function() {

		this.unbind();

	},

	lhs: function(text) {

		this.editor[this.id + '-lhs'].setValue(text);

	},

	rhs: function(text) {

		this.editor[this.id + '-rhs'].setValue(text);

	},

	update: function() {

		this._changing(this.id + '-lhs', this.id + '-rhs');

	},

	unmarkup: function() {

		this._clear();

	},

	scrollTo: function(side, num) {

		var le = this.editor[this.id + '-lhs'];

		var re = this.editor[this.id + '-rhs'];

		if (side == 'lhs') {

			le.setCursor(num);

			le.centerOnCursor();

		}

		else {

			re.setCursor(num);

			re.centerOnCursor();

		}

	},

	options: function(opts) {

		if (opts) {

			jQuery.extend(this.settings, opts);

			if (opts.autoresize) this.resize();

			if (opts.autoupdate) this.update();

			if (opts.hasOwnProperty('rhs_margin')) {

				// dynamically swap the margin

				if (opts.rhs_margin == 'left') {

					this.element.find('.mergely-margin:last-child').insertAfter(

						this.element.find('.mergely-canvas'));

				}

				else {

					var target = this.element.find('.mergely-margin').last();

					target.appendTo(target.parent());

				}

			}

			if (opts.hasOwnProperty('sidebar')) {

				// dynamically enable sidebars

				if (opts.sidebar) {

					jQuery(this.element).find('.mergely-margin').css({display: 'block'});

				}

				else {

					jQuery(this.element).find('.mergely-margin').css({display: 'none'});

				}

			}

		}

		else {

			return this.settings;

		}

	},

	swap: function() {

		if (this.lhs_cmsettings.readOnly || this.rhs_cmsettings.readOnly) return;

		var le = this.editor[this.id + '-lhs'];