newlines - Sublime Text 2 - insert breaks to match current wrapping?

Is there an automated way to insert line breaks at every point where the text is currently wrapping? After this operation, no lines should be wrapped, but it should look visually identical.

Answer

Create a plugin for this. Select Tools » New Plugin… and enter the following script:

import sublime, sublime_plugin

class WrapLinesExCommand(sublime_plugin.TextCommand):
    def run(self, edit):
        wrap_column = 0

        if self.view.settings().get('word_wrap') == False:
            # wrapping is disabled, do nothing
            return

        if self.view.settings().get('wrap_width') == 0:
            # compute wrap column from viewport width
            wrap_column = int(self.view.viewport_extent()[0] / self.view.em_width())
        else:
            wrap_column = self.view.settings().get('wrap_width')

        e = self.view.begin_edit()
        rewrap(self.view, e, wrap_column)
        self.view.end_edit(e)

def rewrap(v, e, column):
    # 0-indexed current line
    current_line_no = 0

    # RHS expression is line count, can change whenever we create a new one
    while current_line_no < v.rowcol(v.size())[0] + 1:
        # where current line drawing starts
        current_line_coords = v.text_to_layout(v.text_point(current_line_no, 0))

        # rightmost character drawn in current viewport
        textpos = v.layout_to_text((v.em_width() * (column), current_line_coords[1]))

        # physical line boundaries as absolute text positions
        current_line = v.line(textpos)

        if textpos < current_line.b:
            # the current line spans multiple rows, so insert a newline at the wrap column

            textpos = v.layout_to_text((v.em_width() * (column), current_line_coords[1]))
            next_line_indent = v.text_to_layout(textpos+1)[0]

            # TODO why -1?
            next_line_indent_chars = int(next_line_indent/(v.em_width()))-1
            # determine how to indent the following line based on how wide the wrapping indents and what the current tab/spaces settings are
            if v.settings().get('translate_tabs_to_spaces') and v.settings().get('use_tab_stops'):
                next_line_indent_chars = next_line_indent_chars / v.settings().get('tab_size')
                next_line_indent_string = '\t' * next_line_indent_chars
            else:
                next_line_indent_string = ' ' * next_line_indent_chars

            # insert newline and spacing at wrap column (sublime hides actual line endings from editor, therefore it's always LF)
            v.insert(e, textpos, '\n' + next_line_indent_string)
        else:
            # only continue to the next line if we didn't edit the current line
            current_line_no = current_line_no + 1

Save e.g. as wrap_lines_ex_command.py in the default (User) directory.

To make this accessible from the menu bar, select the Browse Packages… menu item, navigate to the User folder, and edit Main.sublime-menu (creating it if necessary) as described in this answer so it contains text like e.g. the following:

[
    {
        "id": "edit",
        "children":
        [
            {"id": "wrap"},
            {"command": "wrap_lines_ex", "caption": "Wrap All Lines"}
        ]
    }
]

Screenshots

Before:

After:

Of course, in this case, due to comments being wrapped as well, the code will no longer work. But that's behavior as design per the question.