Line drawn by multiple classes

[woodbri]

I think I have found a weird bug where objects are getting rendered by multiple classes in a layer, which is counter to my understanding of how this should work. So bug in trunk and regression from prior versions.

Here is the scenario, drawing tiger roads I have a lot of class to deal with rendering styles for various categories. I have removed a bunch of classes to simplify this issue down to two classes. In the mapfile fragment below I have marked the two classes that are getting rendered. The second class has a restricted scale on it that is a narrower range that the first class and they have different expressions, but I would still expect the object to only be rendered once.

It looks like in the full mapfile this is getting rendered via 3 separate classes. I stripped the other classes to simplify the example but here is an image showing all three:

​http://imaptools.com:8080/dl/drawn-by-multple-classes.png

The red, the yellow and the orange are each separate classes in this layer.

    LAYER
        NAME "roads"
        METADATA
            "ows_title"     "Roadway features"
            "ows_srs"       "EPSG:4269 EPSG:4326"
            "ows_abstract"  "Road way features from the U.S. Census ROADS data layer."
        END
        TYPE LINE
        TILEINDEX "tidx-ROADS"
        PROJECTION
            "+proj=longlat +ellps=GRS80 +datum=NAD83" #EPSG: 4269
        END
        INCLUDE "map-ROADS.inc"
    END

# map-ROADS.inc

# S1100,    20533, primary
# S1200,   325140, secondary
# S1400, 16320345, local
# S1500,   374859, 4wd trail
# S1630,   176149, ramp
# S1640,   176415, service along highway
# S1710,    17033, walkway
# S1720,      241, stairway
# S1730,    72743, alley
# S1740,  2255679, private
# S1750,   434084, census use
# S1780,    10645, parking lot
# S1820,     2893, bike path
# S1830,       12, bridle path

  MAXSCALEDENOM 500000
  CLASSITEM "RTTYP"
  LABELITEM "FULLNAME"
  SIZEUNITS METERS
  CLASS # <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< this is drawn <<<<<<<<<
    EXPRESSION /^[USC]/
    STYLE
      COLOR "#FFFB89"
      WIDTH 18
      OUTLINECOLOR "#ECD390"
      OUTLINEWIDTH 4 ## make it big to verify this class is drawn ######
    END
    LABEL
      EXPRESSION ('[RTTYP]' = 'U' && '[RTENUM]' ~ '.')
      TEXT '[RTENUM]'
      STYLE
        SYMBOL "U"
        SIZE 20
        MINSIZE 20
        MAXSIZE 20
      END
      SIZE TINY
      POSITION CC
      #OFFSET 1 0
      MINDISTANCE 100
      REPEATDISTANCE 100
      COLOR "#000000"
      PARTIALS FALSE
      PRIORITY 6
    END
    LABEL
      MAXSCALEDENOM 300000
      EXPRESSION ('[RTTYP]' = 'S' && '[RTENUM]' ~ '.')
      TEXT '[RTENUM]'
      STYLE
        SYMBOL "S"
        SIZE 20
        MINSIZE 20
        MAXSIZE 20
      END
      SIZE TINY
      POSITION CC
      MINDISTANCE 100
      REPEATDISTANCE 100
      COLOR "#000000"
      PARTIALS FALSE
      PRIORITY 5
    END
    LABEL
      MAXSCALEDENOM 200000
      TYPE TRUETYPE
      FONT "arial"
      SIZE 16
      MAXSIZE 10
      MINSIZE 8
      COLOR "#816C34"
      OUTLINECOLOR "#FFFB89"
      PARTIALS FALSE
      MINDISTANCE 250
      MINFEATURESIZE 10
      BUFFER 4
      ANGLE FOLLOW
      PRIORITY 7
    END
  END
  CLASS
    MINSCALEDENOM 30000
    EXPRESSION ('[MTFCC]' = 'S1400')
    STYLE
      COLOR "#c1c1a1"
      WIDTH 6
      MINWIDTH 0.5
    END
  END
  CLASS  ## <<<<<<<<<<<<<<<<<<<<<<<<<<<<<< this is draw <<<<<<<<<<<<<<<<
    MAXSCALEDENOM 30000
    EXPRESSION ('[MTFCC]' = 'S1400')
    # tried this expression also and it does not filter it out
    #EXPRESSION ('[MTFCC]' = 'S1400' && ! '[RTTYP]' ~ '^[USC]')
    STYLE
      #COLOR "#FFFFFF"
      COLOR "#FF0000"  ## make it RED to verify this is also drawn #####
      WIDTH 18
      #MINWIDTH 10
      MAXWIDTH 10
      OUTLINECOLOR "#D8D4C8"
      OUTLINEWIDTH 1.0
    END
    LABEL
      MAXSCALEDENOM 20000
      TYPE TRUETYPE
      FONT "arial"
      SIZE 18
      MAXSIZE 10
      MINSIZE 8
      COLOR "#645C58"
      OUTLINECOLOR "#FFFFFF"
      PARTIALS FALSE
      MINDISTANCE 250
      MINFEATURESIZE 10
      BUFFER 4
      ANGLE FOLLOW
      PRIORITY 7
    END
  END

[woodbri]

The mapfile fragment is getting rendered at 27K Scale whan the two classes marked above are getting rendered.