Simplify fp-info-cache escaping mechanism.

Fixes https://gitlab.com/kicad/code/kicad/issues/4969

common/string.cpp

@@ -82,15 +82,9 @@ wxString EscapeString( const wxString& aSource, ESCAPE_CONTEXT aContext )
             else
                 converted += c;
         }
-        else if( aContext == CTX_DELIMITED_STR )
+        else if( aContext == CTX_LINE )
         {
-            if( c == '{' )
-                converted += "{brace}";
-            else if( c == ' ' )
-                converted += "{space}";
-            else if( c == '\t' )
-                converted += "{tab}";
-            else if( c == '\n' || c == '\r' )
+            if( c == '\n' || c == '\r' )
                 converted += "{return}";
             else
                 converted += c;

include/kicad_string.h

@@ -47,7 +47,7 @@ enum ESCAPE_CONTEXT
     CTX_NETNAME,
     CTX_LIBID,
     CTX_QUOTED_STR,
-    CTX_DELIMITED_STR,
+    CTX_LINE,
     CTX_FILENAME
 };
 

pcbnew/footprint_info_impl.cpp

@@ -359,8 +359,8 @@ void FOOTPRINT_LIST_IMPL::WriteCacheToFile( wxTextFile* aCacheFile )
     {
         aCacheFile->AddLine( fpinfo->GetLibNickname() );
         aCacheFile->AddLine( fpinfo->GetName() );
-        aCacheFile->AddLine( EscapeString( fpinfo->GetDescription(), CTX_DELIMITED_STR ) );
-        aCacheFile->AddLine( EscapeString( fpinfo->GetKeywords(), CTX_DELIMITED_STR ) );
+        aCacheFile->AddLine( EscapeString( fpinfo->GetDescription(), CTX_LINE ) );
+        aCacheFile->AddLine( EscapeString( fpinfo->GetKeywords(), CTX_LINE ) );
         aCacheFile->AddLine( wxString::Format( "%d", fpinfo->GetOrderNum() ) );
         aCacheFile->AddLine( wxString::Format( "%u", fpinfo->GetPadCount() ) );
         aCacheFile->AddLine( wxString::Format( "%u", fpinfo->GetUniquePadCount() ) );