Sometimes DHI Mesh Generater generates mesh files with separators con…

…sisting of a mix of tab characters and spaces, so we need to replace the tab characters with spaces before using the MDAL::split function to process the data.

mdal/frmts/mdal_mike21.cpp

@@ -23,6 +23,13 @@
 
 #define DRIVER_NAME "Mike21"
 
+void replaceTabsWithSpaces(std::string& str) {
+    for (size_t i = 0; i < str.length(); ++i) {
+        if (str[i] == '\t') {
+            str[i] = ' ';
+        }
+    }
+}
 
 static bool parse_vertex_id_gaps( std::map<size_t, size_t> &vertexIDtoIndex, size_t vertexIndex, size_t vertexID )
 {
@@ -239,6 +246,7 @@ std::unique_ptr<MDAL::Mesh> MDAL::DriverMike21::load( const std::string &meshFil
   {
     if ( 0 < lineNumber && lineNumber < mVertexCount + 1 )
     {
+      replaceTabsWithSpaces(line);
       chunks = MDAL::split( MDAL::trim( line ),' ');
       if ( chunks.size() != 5 )
       {
@@ -276,6 +284,7 @@ std::unique_ptr<MDAL::Mesh> MDAL::DriverMike21::load( const std::string &meshFil
 
     if ( mVertexCount + 1 < lineNumber )
     {
+      replaceTabsWithSpaces(line);
       chunks = MDAL::split( MDAL::trim( line ),' ');
       assert( faceIndex < faceCount );