Edge-to-edge printing on EPSON XP-8700 Series

[tresf]

As the title suggests, QZ Tray cannot print edge-to-edge on this printer.

When attempting on a customer machine:

• Margins specified as zero
• DPI specified as 144
• Page size defined as 5x7

... however the logs show:

• Top and left margin of .11 inches
• Page size as 4.75x6.75

{
  "call": "print",
  "params": {
    "printer": {
      "name": "EPSON XP-8700 Series"
    },
    "options": {
      "colorType": "color",
      "copies": 1,
      "density": 144,
      "duplex": false,
      "fallbackDensity": 600,
      "interpolation": "bicubic",
      "jobName": null,
      "margins": {
        "top": 0,
        "right": 0,
        "bottom": 0,
        "left": 0
      },
      "orientation": "portrait",
      "paperThickness": null,
      "printerTray": null,
      "rasterize": true,
      "rotation": 0,
      "scaleContent": false,
      "size": {
        "width": "5",
        "height": "7"
      },
      "units": "in",
      "altPrinting": false,
      "encoding": null,
      "endOfDoc": null,
      "perSpool": 1
    },
    "data": [
      {
        "type": "pixel",
        "format": "image",
        "flavor": "file",
        "data": "5x7.png"
}

[tresf]

Quoting some investigation from the customer:

I think the problem might be that for this printer definition there are two paper sizes that overlap, one is borderless. Here are some bits from the ppd file (attached).

*PageSize EPKG/4 x 6 in: "<</PageSize[288.00 432.00]/ImagingBBox null>>setpagedevice"
*PageSize EPKG.NMgn/4 x 6 in (Borderless): "<</PageSize[288.00 432.00]/ImagingBBox null/cupsBorderlessScalingFactor 1.05>>setpagedevice"

*PageRegion EPKG/4 x 6 in: "<</PageSize[288.00 432.00]/ImagingBBox null>>setpagedevice"
*PageRegion EPKG.NMgn/4 x 6 in (Borderless): "<</PageSize[288.00 432.00]/ImagingBBox null/cupsBorderlessScalingFactor 1.05>>setpagedevice"

*ImageableArea EPKG/4 x 6 in: "8.40 8.40 279.60 423.60"
*ImageableArea EPKG.NMgn/4 x 6 in (Borderless): "0.00 0.00 288.00 432.00"

*PaperDimension EPKG/4 x 6 in: "288.00 432.00"
*PaperDimension EPKG.NMgn/4 x 6 in (Borderless): "288.00 432.00"

I'm not sure where/when qztray maps from size onto one of these, if ever, but maybe whatever does this is hitting the first definition.