Support setting the xterm clipboard when copying from copy mode using
the xterm escape sequence for the purpose (if xterm is configured to
allow it).
Written by and much discussed Ailin Nemui, guidance on
xterm/termcap/terminfo from Thomas Dickey.
When mode-mouse is on (it is off by default), automatically enter copy
mode when the mouse is dragged or the mouse wheel is used. Also exit
copy mode when the mouse wheel is scrolled off the bottom. Discussed
with and written by hsim at gmx dot li.
When the mode-mouse option is on, support dragging to make a selection
in copy mode.
Also support the scroll wheel, although xterm strangely does not ignore
it in application mouse mode, causing redraw artifacts when scrolling up
(other terminals appear to be better behaved).
Permit keys in copy mode to be prefixed by a repeat count, entered with
[1-9] in vi mode, or M-[1-9] in emacs mode.
From Micah Cowan, tweaked a little by me.
Extend the end-of-line key so that in normal mode a second press moves
the cursor to the end of a wrapped line (if present) and in rectangle
mode it toggles between the end of the text and the last cell on the
line.
From Micah Cowan.
Another copy mode fix from Micah Cowan: in rectangle copy mode, the cursor
should not wrap at the end of the text on the line but should be allowed to
move freely.
copy mode uses the real screen as backing and if it is updated while copying,
strange things can happen. So, freeze reading from the pty while in copy mode.
vi-style B, W and E keys in copy mode to navigate between words treating only
spaces as word separators. Also add . to the list of word separators for
standard word navigation.
From Micah Cowan, tweaked slightly by me.
Massive spaces->tabs and trailing whitespace cleanup, hopefully for the last
time now I've configured emacs to make them displayed in really annoying
colours...
Cleanup by moving various (mostly horrible) little bits handling UTF-8 grid
data into functions in a new file, grid-utf8.c, and use sizeof intead of
UTF8_DATA.
Also nuke trailing whitespace from tmux.1, reminded by jmc.
Add mode keys to move the cursor to the top, middle and bottom of the screen.
H/M/L in vi mode and M-R/M-r in emacs (bottom of screen not bound in emacs).
Clean up by introducing a wrapper struct for mouse clicks rather than passing
three u_chars around.
As a side-effect this fixes incorrectly rejecting high cursor positions
(because it was comparing them as signed char), reported by Tom Doherty.
Make C-Up and C-Down in copy mode scroll the screen up and down one line
without moving the cursor, like Up and Down in scroll mode (which will shortly
disappear).
When moving up or down in copy mode, save the cursor position and size of the
last line with content (width != 0) and use it to determine if the cursor
should be at the end of the line. Fixes problem of the cursor always jumping to
the end of the line when scrolling past a blank line.
