Support extended mouse coordinates.
Using the legacy method, mouse coordinates can be reported only up to 223. If you have a wider terminal, you cannot use the mouse in the rightmost columns. There exist two extensions to overcome this problem, a broken one invented by xterm (the "DEC 1005" mode) which is supported by xterm, urxvt and iterm2; and a good one invented by urxvt (the "DEC 1015" mode), supported by urxvt and iterm2. Many thanks to Egmont Koblinger email@example.com for report and patch. BUG: 285984 FIXED-IN: 4.9