[RFC] Enable both boxed and plain text selection

[Luca Ferretti <elle uca libero it>]

The boxed text selection is really really useful when you have to cut
and past from a 2 column document (i.e. all LaTeX article type
document :-) .

Using the simple, i-beam text selection currently implemented in Evince,
you can't select only the text in one column: the selection covers both
columns :-| Attached here is the cut and paste from the Ximian Evolution
copyright form.

But the question is: how implement it in the UI? A simple _hidden_
shortcut (i.e. Ctrl+Alt-<MOUSE> to use the boxed selection, or visible
radio menu items like

            Copy
        ----------------------
            Select All
        ----------------------
        (*) Text Lines Selection
        ( ) Text Boxes Selection
        ( ) Images Selection
        ----------------------
            ...

in Edit menu?

For $1, the recognition of being listed as a contributor  5. Developer hereby agrees that if he has or acquires
                                                          hereafter any patent or copyright or other intellectual
to Ximian Evolution from time to time in such a
                                                          property interest dominating the Works, the Program,
medium as Ximian chooses, and other good and
                                                          the Program as enhanced by the Works, or other
valuable consideration received from Ximian, Inc., a
                                                          enhancements to the Program, or the use of any of
Delaware corporation (hereinafter "Ximian"), the
                                                          those, such dominating interest will not be used to
undersigned "Developer" does hereby agree as follows:
                                                          undermine the effect of this assignment, i.e. Ximian and
                                                          the general public will be licensed to use, in that
1.(a) Developer hereby agrees to assign and does hereby
                                                          Program or Programs and their derivative works,
assign to Ximian, its successors and assigns,
                                                          without royalty or limitation, the subject matter of the
Developerâ??s copyright in changes and/or enhancements
                                                          dominating interest. This license provision will be
to the program Ximian Evolution (herein called the
                                                          binding on the assignees of, or other successors to, the
"Program") throughout the world, including any
                                                          dominating interest, as well as on Developer. This
accompanying documentation files and supporting files
                                                          license grant is nonexclusive, royaltyâ??free and nonâ??
as well as the actual program code for the full duration
                                                          cancelable.
of all such rights, and any renewals or extensions
thereof. These changes and/or enhancements are herein
                                                          6. (a) Developer warrants to Ximian that his reports in
called the "Works." This assignment applies to all past
                                                          accord with section 2 above are accurate and that he is
and future Works of Developer that constitute changes
                                                          the sole copyright holder of the Works conveyed either
and enhancements to the Program.
                                                          now or in the future under this agreement. Developer
                                                          agrees to hold Ximian harmless from damage arising
(b) Ximian agrees to grant back to Developer, and does
                                                          out of any breach of this warrantyâ??â??â??any adverse
hereby grant, nonâ??exclusive, royaltyâ??free and nonâ??
                                                          ownership interest not reported by Developer and
cancelable rights to use the Works (i.e., Developerâ??s
                                                          resulting in direct or indirect harm to Ximian.
changes and/or enhancements, not the Program that they
                                                          Developer is not obliged to defend Ximian against any
enhance), as Developer sees fit; this grant back does not
                                                          spurious claim of adverse ownership, but will cooperate
limit Ximianâ??s rights and public rights acquired through
                                                          with Ximian in defending against any such claim and
this agreement.
                                                          will indemnify Ximian for all losses if the claim is not
                                                          spurious, i.e. if the adverse claimant is a true owner and
(c) The parties acknowledge and agree that Ximian is,
                                                          Ximian is thereby damaged, including but not limited to
and has all the rights of, a copyright owner in the
                                                          the amount of all adverse damage judgments and costs
assigned copyrights (subject to the license grantback to