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diff --git a/src/3rdparty/2geom/doc/sweep.svg b/src/3rdparty/2geom/doc/sweep.svg
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@@ -0,0 +1,430 @@
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+ <path
+ sodipodi:nodetypes="cc"
+ style="fill:none;stroke:#000000;stroke-width:3;stroke-miterlimit:4;stroke-opacity:1;stroke-dasharray:none;marker-end:url(#Arrow1Send)"
+ d="m 388.22918,456.94784 c -12.15917,-1.71331 -18.9939,5.12449 -25.22416,12.93305"
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+ <path
+ sodipodi:nodetypes="cc"
+ style="fill:none;stroke:#000000;stroke-width:3;stroke-miterlimit:4;stroke-opacity:1;stroke-dasharray:none;marker-end:url(#Arrow1Send)"
+ d="m 688.46073,501.78863 c 0.007,13.75525 8.4367,18.00622 20.95338,19.09129"
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+ <use
+ x="0"
+ y="0"
+ xlink:href="#path1375"
+ id="use1377"
+ transform="matrix(1,0,0,-1,-0.70939357,971.46722)"
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+ sodipodi:role="line"
+ id="tspan1381"
+ x="623.62207"
+ y="783.07086"
+ style="font-size:12px">this tile has its both ends</tspan><tspan
+ sodipodi:role="line"
+ x="623.62207"
+ y="798.07086"
+ id="tspan1383"
+ style="font-size:12px">in the &quot;known&quot; area, but still</tspan><tspan
+ sodipodi:role="line"
+ x="623.62207"
+ y="813.07086"
+ id="tspan1385"
+ style="font-size:12px">travels through the unknown.</tspan></text>
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+ style="fill:none;stroke:#000000;stroke-width:1;stroke-miterlimit:4;stroke-opacity:1;stroke-dasharray:1, 2;stroke-dashoffset:0;marker-end:url(#Arrow1Send)"
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+ xml:space="preserve"><tspan
+ style="font-size:12px"
+ y="839.76373"
+ x="340.15747"
+ sodipodi:role="line"
+ id="tspan1407">this piece should </tspan><tspan
+ style="font-size:12px"
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+ id="tspan1419">be inserted here</tspan></text>
+ <path
+ sodipodi:nodetypes="cc"
+ style="fill:none;stroke:#000000;stroke-width:1;stroke-miterlimit:4;stroke-opacity:1;stroke-dasharray:none;stroke-dashoffset:0;marker-end:url(#Arrow1Send)"
+ d="m 694.4882,825.59053 c 0,28.34645 -48.419,52.18112 -70.86615,56.69291"
+ id="path1411" />
+ <path
+ sodipodi:nodetypes="cc"
+ style="fill:none;stroke:#000000;stroke-width:1;stroke-miterlimit:4;stroke-opacity:1;stroke-dasharray:1, 2;stroke-dashoffset:0;marker-end:url(#Arrow1Send)"
+ d="M 446.46402,797.25871 C 435.54028,749.38028 382.88666,716.7021 332.35416,712.2047"
+ id="path1415" />
+ <use
+ x="0"
+ y="0"
+ xlink:href="#use883"
+ id="use1417"
+ transform="translate(4.0944874e-7,-28.346454)"
+ width="744.09448"
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+ <text
+ xml:space="preserve"
+ style="font-size:40px;font-style:normal;font-weight:normal;fill:#000000;fill-opacity:1;stroke:none;font-family:Bitstream Vera Sans"
+ x="396.85037"
+ y="726.37793"
+ id="text1425"><tspan
+ id="tspan1429"
+ sodipodi:role="line"
+ x="396.85037"
+ y="726.37793"
+ style="font-size:12px">not there!</tspan></text>
+ <path
+ style="fill:none;stroke:#ff0000;stroke-width:4"
+ d="m 411.02363,768.89761 42.51968,0 m -14.17322,-14.17323 -14.17323,28.34646"
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+ <text
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+ style="font-size:40px;font-style:normal;font-weight:normal;fill:#000000;fill-opacity:1;stroke:none;font-family:Bitstream Vera Sans"
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+ id="text1435"><tspan
+ sodipodi:role="line"
+ x="212.59842"
+ y="357.87399"
+ id="tspan1439"
+ style="font-size:20px">Deformations of the sweep line when crossing a vertex box.</tspan></text>
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+ height="1052.3622"
+ width="744.09448"
+ transform="translate(751.18105,5.1777802e-6)"
+ id="use1457"
+ xlink:href="#path916"
+ y="0"
+ x="0" />
+ <text
+ xml:space="preserve"
+ style="font-size:40px;font-style:normal;font-weight:normal;fill:#000000;fill-opacity:1;stroke:none;font-family:Bitstream Vera Sans"
+ x="170.07874"
+ y="641.33856"
+ id="text1459"><tspan
+ sodipodi:role="line"
+ id="tspan1461"
+ x="170.07874"
+ y="641.33856"
+ style="font-size:20px">Why should tiles be kept in the context until the end of their last box.</tspan></text>
+ </g>
+</svg>