Determines and refines current selection and calls method _changeStateOfBlocks(), where given action is actually done

The main goal of this method is correctly identify the block elements, that are at the beginning and end of the current selection.

Collects all block elements, containing text, which are inside of current selection, and performs for each of them given action. Possible commands and corresponding actions: - "ltr": change direction to left-to-right - "rtl": change direction to right-to-left - "mirror": change direction to opposite - "explicitdir": explicit direction setting - "left": change alignment to left - "right": change alignment to right - "center": change alignment to center - "preparelists": action should be done before executing native insert[un]orderedlist - "prepareoutdent": action should be done before executing native outdent - "prepareindent": action should be done before executing native indent - "prepareformat": action should be done before executing native formatblock - "insertunorderedlist": action should be done after executing native insertunorderedlist - "insertorderedlist": action should be done after executing native insertorderedlist - "indent": action should be done after executing native indent - "outdent": action should be done after executing native outdent - "normalizeindent": emulate indent done by NormalizeIndentOutdent plugin - "normalizeoutdent": emulate outdent done by NormalizeIndentOutdent plugin - "formatblock": action should be done after executing native formatblock

Removes remaining bogus elements, creating by the method _prepareLists()

Collect all selected block elements, which contain or can contain text. Walk through DOM tree between start and end points of current selection.

Initialize specific button.

Change direction and/or alignment of each node from the given array.

Call native command for nodes inside selection

Sometimes native commands "insertorderedlist", "insertunorderedlist", "indent", "outdent" and "formatblocks" are the cause of various problems. These problems have different levels of severity - from crashing of their executing or damage of the editor's content to creating visually correct results, which however can cause the future problems,
not always bidi-specific. For example, Webkit fails with insertlist commands, if selection
contains some block element (like

or

), followed by the table, and few cells of
this table.IE fails,when try to handle insertlist command for list items, containing

.
Mozilla and IE produce wrong results for selection,containing more then one cell. Mozilla
merges contents of some listitems with "formatblock" command. Safari places DIV's in the 
same list with newly created list items. Webkit creates multilevel blocks to format the text.
IE adds to the list lines of the text,which are outside the selection. Webkit put whole table
into list item. All browsers lose direction and alignment styles with outdent command,
executed for items from one-level list. Etc.
We try to avoid these problems and produce correct (and more or less similar) results for
all supported browsers. This is achieved by separating the each above-mentioned command into 
three parts.
The first ("preparelist","prepareindent","prepareoutdent" and "prepareformat") is performed 
before corresponding native call. It prepares selected region of the editor's content by 
rebuilding it with strong block structure and keeps info about each group of selected
elements. Separate groups are created for contents of each table cell, as well as for lines of 
text that are before, after and between tables. In case of webkit and insertlist or formatblocks
commands, each selected block element is placed into separate "group".
The second part of the command is native call itself. Native calls are executed separately
for each group of nodes. This requires to reset a selection, each time limiting it to only
the elements of the current group. 
The third part is perfomed after native call. Its role is to restore missing styles,
to delete bogus elements, created in the previous steps, to merge sibling lists etc.
Corresponding commands have the same names, as native (e.g., "insertorderedlist',
"insertunorderedlist", "indent", "outdent" and "formatblocks"), because just they produce 
the final result. For IE and Mozilla we call one "post" command per native call. For webkit 
we call one "post" command per group of elements.

Parameter	Type	Description
cmd	undefined	Name of the command (like "insertorderedlist" or "indent")
arg	undefined	Arguments of the command
info	undefined	Object containing nodes: array of all block nodes, which should be handled by this command groups: array containing groups of nodes. Nodes from each group should be handled by separate execution of current command cells: array of cells, contents of which should be handled by current command

Returns:boolean