automatic rectangle padding feature; replace by non-destructive
virtual rectangle edges feature.
(cua-virtual-rectangle-edges): New defcustom.
(cua-auto-tabify-rectangles): New defcustom.
(cua-paste): If paste into a marked rectangle, insert rectangle at
current column, even if virtual; also paste exactly as many lines
as has been marked (ignore additional lines or add empty lines),
but paste whole source if only one line is marked.
(cua--update-indications): No longer use overwrite-cursor to
indicate rectangle padding
(cua--rectangle-virtual-edges): New defun.
(cua--rectangle-get-corners): Remove optional PAD arg.
(cua--rectangle-set-corners): Never do padding.
(cua--forward-line): Remove optional PAD arg. Simplify.
(cua-resize-rectangle-right, cua-resize-rectangle-left)
(cua-resize-rectangle-down, cua-resize-rectangle-up):
(cua-resize-rectangle-bot, cua-resize-rectangle-top)
(cua-resize-rectangle-page-up, cua-resize-rectangle-page-down)
(cua--rectangle-move): Never do padding. Simplify.
(cua--tabify-start): New defun.
(cua--rectangle-operation): Add tabify arg. All callers changed.
(cua--pad-rectangle): Remove.
(cua--delete-rectangle): Handle delete with virtual edges.
(cua--extract-rectangle): Add spaces if rectangle has virtual edges.
(cua--insert-rectangle): Handle insert at virtual column.
Perform auto-tabify if necessary.
(cua--activate-rectangle): Remove optional FORCE arg.
Never do padding. Simplify.
(cua--highlight-rectangle): Enhance for virtual edges.
(cua-toggle-rectangle-padding): Remove command.
(cua-toggle-rectangle-virtual-edges): New command.
(cua-sequence-rectangle): Add optional TABIFY arg. Callers changed.
(cua--rectangle-post-command): Don't force rectangle padding.
(cua--init-rectangles): Bind M-p to cua-toggle-rectangle-virtual-edges.
M-Drag-Mouse-1 does not alter the kill ring, setting it with M-Mouse-1
and M-Mouse-3 does.
(Mode Line Mouse): C-Mouse-2 on scroll bar now also works for
toolkit scroll bars.
(Scroll Bars): Ditto.
non-selected window is indicated by a hollow box.
(Split Window): Side by side windows are separated by a scrollbar,
if scrollbars are used.
C-Mouse-2 on scrollbar now also works for toolkit scrollbars.
(Change Window): Correct Mouse-2 vs Mouse-3 mess-up.
(Window Convenience): Update bindings for `winner-undo' and `winner-redo'.
Rearrange order of nodes and sections such that both "GNU GENERAL
PUBLIC LICENSE" and "GNU Free Documentation License" appear at the
end, as appropriate for appendices.
(Acknowledgments): Use `@unnumberedsec'.
strings in menu items.
(single_submenu): Use ENCODE_MENU_STRING
(mac_menu_show): Use ENCODE_MENU_STRING. Reset grabbed because
button release isn't passed to event loop
(add_menu_item): Use SetMenuItemWithCFString