message: Avoid selecting red as a highlight colour for filters
diff: @@ -3238,9 +3238,16 @@ void AddFilterSelections(QTextCursor cursor, int &idx, QColor backCol, QColor fo
  if(hasMust && f.matchType == MatchType::Normal)
  ignored = true;
  - QColor col = QColor::fromHslF(float(idx++ % 6) / 6.0f, ignored ? 0.0f : 1.0f,
  + // we use 6 colours around the wheel to get reasonable distinction. Note that this is not
  + // critical information and selecting each entry will underline it in the phrase, since we want
  + // to be colour blind friendly where possible.
  + // we avoid the 60 degrees near red (which is at 0) to avoid confusion with errors.
  + QColor col = QColor::fromHslF((float(idx) / 6.0f) * (300.0f / 360.0f) + (0.5f / 6.0f),
  + ignored ? 0.0f : 1.0f,
  qBound(0.05, 0.2 * 0.5 + 0.8 * backCol.lightnessF(), 0.95));
  + idx = (idx + 1) % 6;
  +
  f.col = col;
  sel.cursor.setPosition(f.position, QTextCursor::MoveAnchor);
  