lib symbols: make fp filter tolerant to spaces in names.

For historical reasons they are stored in a string using spaces as separators.
So each fp filter is now escaped to remove spaces (replaced by {space})
Fixes #9009
https://gitlab.com/kicad/code/kicad/issues/9009

common/string_utils.cpp

@@ -211,6 +211,15 @@ wxString EscapeString( const wxString& aSource, ESCAPE_CONTEXT aContext )
             else
                 converted += c;
         }
+        else if( aContext == CTX_NO_SPACE )
+        {
+            if( c == ' ' )
+                converted += "{space}";
+            else if( c == '{' )
+                converted += "{brace}";
+            else
+                converted += c;
+        }
         else
             converted += c;
     }

eeschema/sch_plugins/kicad/sch_sexpr_parser.cpp

@@ -851,7 +851,10 @@ LIB_FIELD* SCH_SEXPR_PARSER::parseProperty( std::unique_ptr<LIB_SYMBOL>& aSymbol
         wxStringTokenizer tokenizer( value );
 
         while( tokenizer.HasMoreTokens() )
-            filters.Add( tokenizer.GetNextToken() );
+        {
+            wxString curr_token = UnescapeString( tokenizer.GetNextToken() );
+            filters.Add( curr_token );
+        }
 
         aSymbol->SetFPFilters( filters );
         return nullptr;

eeschema/sch_plugins/kicad/sch_sexpr_plugin.cpp

@@ -1750,10 +1750,13 @@ void SCH_SEXPR_PLUGIN_CACHE::saveDcmInfoAsFields( LIB_SYMBOL* aSymbol, OUTPUTFOR
 
         for( auto filter : fpFilters )
         {
+            // Spaces are not handled in fp filter names so escape spaces if any
+            wxString curr_filter = EscapeString( filter, ESCAPE_CONTEXT::CTX_NO_SPACE );
+
             if( tmp.IsEmpty() )
-                tmp = filter;
+                tmp = curr_filter;
             else
-                tmp += " " + filter;
+                tmp += " " + curr_filter;
         }
 
         LIB_FIELD description( -1, wxString( "ki_fp_filters" ) );

include/string_utils.h

@@ -55,7 +55,8 @@ enum ESCAPE_CONTEXT
     CTX_LIBID,
     CTX_QUOTED_STR,
     CTX_LINE,
-    CTX_FILENAME
+    CTX_FILENAME,
+    CTX_NO_SPACE        // to replace spaces in names that do not accept spaces
 };
 
 /**