[Feature idea] Sketcher Ctrl-C ctrl-V between projects

[paddle]

Ok so the trick was to apply the save and restore functions on the PropertyGeometryList and PropertyConstraintList level. This actually simplified my code by an order of magnitude.

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        Base::StringWriter writer;
        Part::PropertyGeometryList geoToCopy;
        std::vector< Part::Geometry* > newVals;

        for (int i = 0; i < listOfGeoId.size(); i++) {
            const Part::Geometry* Geo = this->getGeometry(listOfGeoId[i]);
            Part::Geometry* geoNew = Geo->copy();
            newVals.push_back(geoNew);
        }
        geoToCopy.setValues(std::move(newVals));
        geoToCopy.Save(writer);

Now the copy paste works perfectly, even between sketches or even between computers. You can even copy paste on the forum to share geometries. Cherry on top is that it uses the syntax and code of the file xml. See this below is the result of my ctrl-C :

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<GeometryList count="3">
    <Geometry  type="Part::GeomCircle">
        <GeoExtensions count="1">
            <GeoExtension type="Sketcher::SketchGeometryExtension" internalGeometryType="0" geometryModeFlags="00000000000000000000000000000000" geometryLayer="0"/>
        </GeoExtensions>
        <Circle CenterX="-94.6912" CenterY="17.6837" CenterZ="0" NormalX="0" NormalY="0" NormalZ="1" AngleXU="-0" Radius="7.55394"/>
    </Geometry>
    <Geometry  type="Part::GeomLineSegment">
        <GeoExtensions count="1">
            <GeoExtension type="Sketcher::SketchGeometryExtension" internalGeometryType="0" geometryModeFlags="00000000000000000000000000000000" geometryLayer="0"/>
        </GeoExtensions>
        <LineSegment StartX="-52.3398" StartY="32.4906" StartZ="0" EndX="-97.8044" EndY="-2.98786" EndZ="0"/>
    </Geometry>
    <Geometry  type="Part::GeomCircle">
        <GeoExtensions count="1">
            <GeoExtension type="Sketcher::SketchGeometryExtension" internalGeometryType="0" geometryModeFlags="00000000000000000000000000000000" geometryLayer="0"/>
        </GeoExtensions>
        <Circle CenterX="-70.0938" CenterY="18.6362" CenterZ="0" NormalX="0" NormalY="0" NormalZ="1" AngleXU="-0" Radius="17.0619"/>
    </Geometry>
</GeometryList>
<ConstraintList count="7">
    <Constrain Name="" Type="6" Value="57.6693" First="1" FirstPos="1" Second="1" SecondPos="2" Third="-2000" ThirdPos="0" LabelDistance="8.56602" LabelPosition="-10.5379" IsDriving="1" IsInVirtualSpace="0" IsActive="1" />
    <Constrain Name="" Type="11" Value="7.55394" First="0" FirstPos="0" Second="-2000" SecondPos="0" Third="-2000" ThirdPos="0" LabelDistance="8.8168" LabelPosition="0.286939" IsDriving="1" IsInVirtualSpace="0" IsActive="1" />
    <Constrain Name="" Type="13" Value="0" First="2" FirstPos="3" Second="1" SecondPos="0" Third="-2000" ThirdPos="0" LabelDistance="10" LabelPosition="0" IsDriving="1" IsInVirtualSpace="0" IsActive="1" />
    <Constrain Name="" Type="5" Value="0" First="2" FirstPos="0" Second="0" SecondPos="0" Third="-2000" ThirdPos="0" LabelDistance="10" LabelPosition="0" IsDriving="1" IsInVirtualSpace="0" IsActive="1" />
    <Constrain Name="" Type="7" Value="70.0938" First="2" FirstPos="3" Second="-1" SecondPos="1" Third="-2000" ThirdPos="0" LabelDistance="7.51938" LabelPosition="-15.1256" IsDriving="1" IsInVirtualSpace="0" IsActive="1" />
    <Constrain Name="" Type="8" Value="18.6362" First="-1" FirstPos="1" Second="2" SecondPos="3" Third="-2000" ThirdPos="0" LabelDistance="-19.9213" LabelPosition="-1.79875" IsDriving="1" IsInVirtualSpace="0" IsActive="1" />
    <Constrain Name="" Type="11" Value="17.0619" First="2" FirstPos="0" Second="-2000" SecondPos="0" Third="-2000" ThirdPos="0" LabelDistance="9.47208" LabelPosition="-0.0775251" IsDriving="1" IsInVirtualSpace="0" IsActive="1" />
</ConstraintList>

To try it out :
https://github.com/PaddleStroke/FreeCAD/tree/ctrlCctrlV
For information it's build on top of my constrainContextually branch. It doesn't requires it actually so another branch could made from the commits to be PR to upstream as standalone.