impr: Implement better string limiting algorithm

lib/libimhex/include/hex/helpers/utils.hpp

@@ -294,12 +294,29 @@ namespace hex {
     [[nodiscard]] std::optional<std::string> getEnvironmentVariable(const std::string &env);
 
     [[nodiscard]] inline std::string limitStringLength(const std::string &string, size_t maxLength) {
-        if (string.size() < maxLength) return string;
+        // If the string is shorter than the max length, return it as is
+        if (string.size() < maxLength)
+            return string;
 
+        // If the string is longer than the max length, find the last space before the max length
         auto it = string.begin() + maxLength;
         while (it != string.begin() && !std::isspace(*it)) --it;
 
-        return std::string(string.begin(), it) + "...";
+        // If there's no space before the max length, just cut the string
+        if (it == string.begin()) {
+            it = string.begin() + maxLength;
+
+            // Try to find a UTF-8 character boundary
+            while (it != string.begin() && (*it & 0x80) != 0x00) --it;
+            ++it;
+        }
+
+        // If we still didn't find a valid boundary, just return the string as is
+        if (it == string.begin())
+            return string;
+
+        // Append
+        return std::string(string.begin(), it) + "…";
     }
 
     [[nodiscard]] std::optional<std::fs::path> getInitialFilePath();