Improve normalization

serial.go

@@ -326,7 +326,9 @@ type SerialSettings struct {
 	EnableEcho         bool          `json:"enableEcho"`         // Whether to echo received characters back to the sender
 	NormalizeMode      string        `json:"normalizeMode"`      // Normalization mode: "carret", "names", "hex"
 	NormalizeLineEnd   string        `json:"normalizeLineEnd"`   // Line ending normalization: "keep", "lf", "cr", "crlf"
+	TabRender          string        `json:"tabRender"`          // How to render tabs: "spaces", "arrow", "pipe"
 	PreserveANSI       bool          `json:"preserveANSI"`       // Whether to preserve ANSI escape codes
+	ShowNLTag          bool          `json:"showNLTag"`          // Whether to show a special tag for new lines
 	Buttons            []QuickButton `json:"buttons"`            // Custom quick buttons
 }
 
@@ -438,7 +440,7 @@ func getSerialSettings() (SerialSettings, error) {
 
 	if consoleBroker != nil {
 		norm := NormOptions{
-			Mode: normalizeMode, CRLF: crlfMode, TabRender: "", PreserveANSI: serialConfig.PreserveANSI,
+			Mode: normalizeMode, CRLF: crlfMode, TabRender: serialConfig.TabRender, PreserveANSI: serialConfig.PreserveANSI, ShowNLTag: serialConfig.ShowNLTag,
 		}
 		consoleBroker.SetNormOptions(norm)
 	}
@@ -533,7 +535,7 @@ func setSerialSettings(newSettings SerialSettings) error {
 
 	if consoleBroker != nil {
 		norm := NormOptions{
-			Mode: normalizeMode, CRLF: crlfMode, TabRender: "", PreserveANSI: serialConfig.PreserveANSI,
+			Mode: normalizeMode, CRLF: crlfMode, TabRender: serialConfig.TabRender, PreserveANSI: serialConfig.PreserveANSI, ShowNLTag: serialConfig.ShowNLTag,
 		}
 		consoleBroker.SetNormOptions(norm)
 	}

serial_console_helpers.go

@@ -46,6 +46,7 @@ type NormOptions struct {
 	CRLF         CRLFMode
 	TabRender    string // e.g. "    " or "" to keep '\t'
 	PreserveANSI bool
+	ShowNLTag    bool // <- NEW: also print a visible tag for CR/LF
 }
 
 func normalize(in []byte, opt NormOptions) string {
@@ -88,42 +89,68 @@ func normalize(in []byte, opt NormOptions) string {
 			}
 		}
 
-		// CR/LF normalization
+		// CR/LF normalization (emit real newline(s), optionally tag them visibly)
 		if b == '\r' || b == '\n' {
+			// detect pair (CRLF or LFCR)
+			isPair := i+1 < len(in) &&
+				((b == '\r' && in[i+1] == '\n') || (b == '\n' && in[i+1] == '\r'))
+
+			// optional visible tag of what we *saw*
+			if opt.ShowNLTag {
+				if isPair {
+					if b == '\r' { // saw CRLF
+						out.WriteString("<CRLF>")
+					} else { // saw LFCR
+						out.WriteString("<LFCR>")
+					}
+				} else {
+					if b == '\r' {
+						out.WriteString("<CR>")
+					} else {
+						out.WriteString("<LF>")
+					}
+				}
+			}
+
+			// now emit the actual newline(s) per the normalization mode
 			switch opt.CRLF {
 			case CRLFAsIs:
-				out.WriteByte(b)
+				if isPair {
-				i++
+					out.WriteByte(b)
+					out.WriteByte(in[i+1])
+					i += 2
+				} else {
+					out.WriteByte(b)
+					i++
+				}
 			case CRLF_LF:
-				if i+1 < len(in) && ((b == '\r' && in[i+1] == '\n') || (b == '\n' && in[i+1] == '\r')) {
+				if isPair {
 					i += 2
 				} else {
 					i++
 				}
 				out.WriteByte('\n')
 			case CRLF_CR:
-				if i+1 < len(in) && ((b == '\r' && in[i+1] == '\n') || (b == '\n' && in[i+1] == '\r')) {
+				if isPair {
 					i += 2
 				} else {
 					i++
 				}
 				out.WriteByte('\r')
 			case CRLF_CRLF:
-				if i+1 < len(in) && ((b == '\r' && in[i+1] == '\n') || (b == '\n' && in[i+1] == '\r')) {
+				if isPair {
-					out.WriteString("\n")
 					i += 2
 				} else {
-					out.WriteString("\n")
 					i++
 				}
+				out.WriteString("\r\n") // (fixed to actually write CRLF)
 			case CRLF_LFCR:
-				if i+1 < len(in) && ((b == '\r' && in[i+1] == '\n') || (b == '\n' && in[i+1] == '\r')) {
+				if isPair {
-					out.WriteString("\r")
 					i += 2
 				} else {
-					out.WriteString("\r")
 					i++
 				}
+				out.WriteString("\n\r")
 			}
 			continue
 		}

ui/src/components/extensions/SerialConsole.tsx

@@ -33,7 +33,9 @@ interface SerialSettings {
   enableEcho: boolean; // future use
   normalizeMode: string; // future use
   normalizeLineEnd: string; // future use
+  tabRender: string; // future use
   preserveANSI: boolean; // future use
+  showNLTag: boolean; // future use
   buttons: QuickButton[];
 }
 
@@ -56,7 +58,9 @@ export function SerialConsole() {
     enableEcho: false,
     normalizeMode: "names",
     normalizeLineEnd: "keep",
+    tabRender: "",
     preserveANSI: true,
+    showNLTag: true,
     buttons: [],
   });
 
@@ -247,7 +251,7 @@ export function SerialConsole() {
           {/* Serial settings (collapsible) */}
           {!buttonConfig.hideSerialSettings && (
             <>
-              <div className="grid grid-cols-2 gap-4">
+              <div className="grid grid-cols-2 gap-4 mb-1">
                 <SelectMenuBasic
                   label="Baud Rate"
                   options={[
@@ -365,6 +369,35 @@ export function SerialConsole() {
                     }}
                   />
                 </div>
+                <div>
+                  <SelectMenuBasic
+                    className="mb-1"
+                    label="Show newline tag"
+                    options={[
+                      { label: "Hide <LF> tag", value: "hide" },
+                      { label: "Show <LF> tag", value: "show" },
+                    ]}
+                    value={buttonConfig.showNLTag ? "show" : "hide"}
+                    onChange={(e) => {
+                      handleSerialSettingsChange("showNLTag", e.target.value === "show")
+                    }}
+                  />
+                </div>
+                <div>
+                  <InputFieldWithLabel
+                    size="MD"
+                    type="text"
+                    label="Tab replacement"
+                    placeholder="ex. spaces, →, |"
+                    value={buttonConfig.tabRender}
+                    onChange={e => {
+                      handleSerialSettingsChange("tabRender", e.target.value)
+                    }}
+                  />
+                  <div className="text-xs text-white opacity-70 mt-1">
+                    Empty for no replacement
+                  </div>
+                </div>
               </div>
               <div className="space-y-4 m-2">
                 <SettingsItem