TopoViewer layer styles not honoured

[strk]

The DBManager TopoViewer plugin uses templates to style layers added to the canvas.
I noticed that the color of symbols, found in the qml file, are not honoured, and rather QGIS assigns a different color to nodes everytime a new TopoViewer run is executed.

This is a snippet from python/plugins/db_manager/db_plugins/postgis/plugins/qgis_topoview/templates/node.qml:

  <transparencyLevelInt>255</transparencyLevelInt>
  <singlesymbol>
    <symbol>
      <lowervalue></lowervalue>
      <uppervalue></uppervalue>
      <label></label>
      <pointsymbol>hard:circle</pointsymbol>
      <pointsize>4</pointsize>
      <pointsizeunits>pixels</pointsizeunits>
      <rotationclassificationfieldname></rotationclassificationfieldname>
      <scaleclassificationfieldname></scaleclassificationfieldname>
      <symbolfieldname></symbolfieldname>
      <outlinecolor red="0" blue="0" green="0"/>
      <outlinestyle>SolidLine</outlinestyle>
      <outlinewidth>0.26</outlinewidth>
      <fillcolor red="196" blue="176" green="201"/>
      <fillpattern>SolidPattern</fillpattern>
      <texturepath>../../../../../../../../../src/qgis/plugins/db_manager/db_manager/db_plugins/postgis/plugins/qgis_topoview</texturepath>
    </symbol>
  </singlesymbol>

Shouldn't the point always be red="196" blue="176" and green="201" ? Why is it not ? Is this an incompatibility of the qml format ?

NOTE: the file outer node has parameter qgis version="1.9.0-Master"

[strk]

According to @nyalldawson from the mailing list the styles created with 1.9 are not supported anymore starting with qgis 3.0 but can be converted by opening them with 2.18 and saving them again.

Convoluted process, but will have to be done for branches 3.4, 3.8 and master, in order to get a correctly styled TopoViewer layer group ...