Fix black rectangles in QC plot SVG and PDF exports

[ankurjuneja]

Rationale

The y-axis zoom feature adds invisible hit-area rects to the live plot SVG using fill: transparent. QC plot export serializes that same live SVG (BaseQCPlotPanel.getExportSVGStr → LABKEY.vis.SVGConverter) and POSTs it to visualization-exportPDF/exportImage, where DocumentConversionServiceImpl renders it with Batik/FOP. transparent is not a valid SVG 1.1 value, so Batik falls back to the initial value — black — and the overlays paint solid black bars over the y-axis labels and the legend.

Related Pull Requests

• Click/drag zooming for QC plots #1209

Changes

[labkey-jeckels]

This works in practice but every export now logs the following to stdout or stderr. Can we avoid it?

[ERROR] Transcoder - null
Enclosed Exception:
<unknown>:
The attribute "style" represents an invalid CSS declaration ("fill: rgb(255, 255, 255); fill-opacity: 0; pointer-events: all; cursor: zoom-out;").
Original message:
The "zoom-out" identifier is not a valid value for the "cursor" property.