Extra two pixels in OSD text area width when double font size is used

[specadmin]

1. Create 300 pixels window

    WindowConfig wndConf;
    wndConf.left = 0;
    wndConf.top = 10;
    wndConf.width = 300;
    wndConf.height = 100;
    wndConf.bodyColor = CL_YELLOW;
    wndConf.borderColor = CL_RED;
    wndConf.borderWidth = 0;
    OSD.window[0] = createWindow(wndConf);

2. Add two similar text areas, one with double font size:

    FontRowStyle rowStyle;
    FontAreaStyle fontStyle;
    map1->addEmptyRow(20);
    rowStyle.doubleSize = true;
    rowStyle.tracking = 8;
    CFontRow* row1 = map1->addRow(36, rowStyle);
    fontStyle.alignment = ALIGN_CENTER;
    fontStyle.fontColor = CL_YELLOW;
    fontStyle.bgColor = CL_BLUE;
    fontStyle.fontFace = FONT_BASIC;
    row1->addArea(0, 290, "OK", fontStyle);
    map1->addEmptyRow(1);
    rowStyle.doubleSize = false;
    CFontRow* row2 = map1->addRow(18, rowStyle);
    row2->addArea(0, 290, "LOOK AROUND", fontStyle);

Result: area #1 has 292 pixels width, while area #2 has 290, as expected to be.

Expectation: all areas should have the width, as defined in addArea() method.