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	Remove support for the UTF-8 mouse extension. This was a briefly used,
poor idea that was fairly quickly replaced by SGR mouse input (which is now widespread). It is impossible to tell the difference between UTF-8 and non-UTF-8 mouse input; since the mouse-utf8 option was removed tmux has not handled it correctly in any case; and it is ridiculous to have three different forms of mouse input.
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								tty.c
									
									
									
									
									
								
							
							
						
						
									
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								tty.c
									
									
									
									
									
								
							@@ -521,21 +521,15 @@ tty_update_mode(struct tty *tty, int mode, struct screen *s)
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		}
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		tty->cstyle = s->cstyle;
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	}
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	if (changed & (ALL_MOUSE_MODES|MODE_MOUSE_UTF8)) {
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	if (changed & ALL_MOUSE_MODES) {
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		if (mode & ALL_MOUSE_MODES) {
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			/*
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			 * Enable the UTF-8 (1005) extension if configured to.
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			 * Enable the SGR (1006) extension unconditionally, as
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			 * this is safe from misinterpretation. Do it in this
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			 * order, because in some terminals it's the last one
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			 * that takes effect and SGR is the preferred one.
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			 */
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			if (mode & MODE_MOUSE_UTF8)
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				tty_puts(tty, "\033[?1005h");
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			else
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				tty_puts(tty, "\033[?1005l");
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			tty_puts(tty, "\033[?1006h");
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			if (mode & MODE_MOUSE_BUTTON)
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				tty_puts(tty, "\033[?1002h");
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			else if (mode & MODE_MOUSE_STANDARD)
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@@ -545,10 +539,7 @@ tty_update_mode(struct tty *tty, int mode, struct screen *s)
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				tty_puts(tty, "\033[?1002l");
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			else if (tty->mode & MODE_MOUSE_STANDARD)
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				tty_puts(tty, "\033[?1000l");
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			tty_puts(tty, "\033[?1006l");
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			if (tty->mode & MODE_MOUSE_UTF8)
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				tty_puts(tty, "\033[?1005l");
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		}
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	}
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	if (changed & MODE_KKEYPAD) {
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