10 

    11 	// Checks if the selection/caret is at the start of the specified block element

    12 	function isAtStart(rng, par) {

    13 		var doc = par.ownerDocument, rng2 = doc.createRange(), elm;

    14 

    15 		rng2.setStartBefore(par);

    16 		rng2.setEnd(rng.endContainer, rng.endOffset);

    17 

    18 		elm = doc.createElement('body');

    19 		elm.appendChild(rng2.cloneContents());

    20 

    21 		// Check for text characters of other elements that should be treated as content

    22 		return elm.innerHTML.replace(/<(br|img|object|embed|input|textarea)[^>]*>/gi, '-').replace(/<[^>]+>/g, '').length == 0;

    23 	};

    72 				// Fixes an issue on Gecko where it's impossible to place the caret behind a table

    73 				// This fix will force a paragraph element after the table but only when the forced_root_block setting is enabled

    74 				if (!tinymce.isIE && ed.getParam('forced_root_block')) {

    75 					function fixTableCaretPos() {

    76 						var last = ed.getBody().lastChild;

    77 

    78 						if (last && last.nodeName == 'TABLE')

    79 							ed.dom.add(ed.getBody(), 'p', null, '<br mce_bogus="1" />');

    80 					};

    81 

    82 					// Fixes an bug where it's impossible to place the caret before a table in Gecko

    83 					// this fix solves it by detecting when the caret is at the beginning of such a table

    84 					// and then manually moves the caret infront of the table

    85 					if (tinymce.isGecko) {

    86 						ed.onKeyDown.add(function(ed, e) {

    87 							var rng, table, dom = ed.dom;

    88 

    89 							// On gecko it's not possible to place the caret before a table

    90 							if (e.keyCode == 37 || e.keyCode == 38) {

    91 								rng = ed.selection.getRng();

    92 								table = dom.getParent(rng.startContainer, 'table');

    93 

    94 								if (table && ed.getBody().firstChild == table) {

    95 									if (isAtStart(rng, table)) {

    96 										rng = dom.createRng();

    97 

    98 										rng.setStartBefore(table);

    99 										rng.setEndBefore(table);

   100 

   101 										ed.selection.setRng(rng);

   102 

   103 										e.preventDefault();

   104 									}

   105 								}

   106 							}

   107 						});

   108 					}

   109 

   110 					ed.onKeyUp.add(fixTableCaretPos);

   111 					ed.onSetContent.add(fixTableCaretPos);

   112 					ed.onVisualAid.add(fixTableCaretPos);

   113 

   114 					ed.onPreProcess.add(function(ed, o) {

   115 						var last = o.node.lastChild;

   116 

   117 						if (last && last.childNodes.length == 1 && last.firstChild.nodeName == 'BR')

   118 							ed.dom.remove(last);

   119 					});

   120 

   121 					fixTableCaretPos();

   122 				}

   123