This must be where we drop the tab character, as it's considered a "control" character:

Lines 92 to 135 in e82046a

    
           /// Translate IRC color codes using the callback, and remove ASCII control chars from the input. 
        
           pub(crate) fn translate_irc_control_chars( 
        
               str: &str, 
        
               push_color: fn(ret: &mut String, fg: u8, bg: Option<u8>), 
        
           ) -> String { 
        
               let mut ret = String::with_capacity(str.len()); 
        
               let mut iter = str.chars().peekable(); 
        
               while let Some(char) = iter.next() { 
        
                   if char == '\x03' { 
        
                       match parse_color_code(&mut iter) { 
        
                           None => { 
        
                               // just skip the control char 
        
                           } 
        
                           Some(fg) => { 
        
                               if let Some(char) = iter.peek().cloned() { 
        
                                   if char == ',' { 
        
                                       iter.next(); // consume ',' 
        
                                       match parse_color_code(&mut iter) { 
        
                                           None => { 
        
                                               // comma was not part of the color code, 
        
                                               // add it to the new string 
        
                                               push_color(&mut ret, fg, None); 
        
                                               ret.push(char); 
        
                                           } 
        
                                           Some(bg) => { 
        
                                               push_color(&mut ret, fg, Some(bg)); 
        
                                           } 
        
                                       } 
        
                                   } else { 
        
                                       push_color(&mut ret, fg, None); 
        
                                   } 
        
                               } else { 
        
                                   push_color(&mut ret, fg, None); 
        
                               } 
        
                           } 
        
                       } 
        
                   } else if !char.is_ascii_control() { 
        
                       ret.push(char); 
        
                   } 
        
               } 
        
               ret 
        
           }

	/// Translate IRC color codes using the callback, and remove ASCII control chars from the input.
	pub(crate) fn translate_irc_control_chars(
	str: &str,
	push_color: fn(ret: &mut String, fg: u8, bg: Option<u8>),
	) -> String {
	let mut ret = String::with_capacity(str.len());
	let mut iter = str.chars().peekable();

	while let Some(char) = iter.next() {
	if char == '\x03' {
	match parse_color_code(&mut iter) {
	None => {
	// just skip the control char
	}
	Some(fg) => {
	if let Some(char) = iter.peek().cloned() {
	if char == ',' {
	iter.next(); // consume ','
	match parse_color_code(&mut iter) {
	None => {
	// comma was not part of the color code,
	// add it to the new string
	push_color(&mut ret, fg, None);
	ret.push(char);
	}
	Some(bg) => {
	push_color(&mut ret, fg, Some(bg));
	}
	}
	} else {
	push_color(&mut ret, fg, None);
	}
	} else {
	push_color(&mut ret, fg, None);
	}
	}
	}
	} else if !char.is_ascii_control() {
	ret.push(char);
	}
	}

	ret
	}

Tab characters not shown in TUI #305

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