Filter variation selectors from shortName field

Meshtastic/Extensions/String.swift

@@ -90,4 +90,15 @@ extension String {
 		let end = index(start, offsetBy: range.upperBound - range.lowerBound)
 		return String(self[start ..< end])
 	}
+
+	// Filter out variation selectors from the string
+	var withoutVariationSelectors: String {
+		return self.unicodeScalars
+			.filter { scalar in
+				return !scalar.properties.isVariationSelector
+			}
+			.compactMap { UnicodeScalar($0) }
+			.map { String($0) }
+			.joined()
+	}
 }

Meshtastic/Views/Settings/UserConfig.swift

@@ -75,11 +75,16 @@ struct UserConfig: View {
 							TextField("Short Name", text: $shortName)
 								.foregroundColor(.gray)
 								.onChange(of: shortName) {
-									var totalBytes = shortName.utf8.count
+									let newValue = shortName.withoutVariationSelectors
+									let totalBytes = newValue.utf8.count
 									// Only mess with the value if it is too big
 									if totalBytes > 4 {
+										// If too long, drop the last thing entered
 										shortName = String(shortName.dropLast())
-										totalBytes = shortName.utf8.count
+									} else if shortName != newValue {
+										// If not too long, make sure the stripped
+										// variant is placed back in text field if necessary
+										shortName = newValue
 									}
 								}
 								.foregroundColor(.gray)