Transaction not applied

[andrew]

From a QCAD user:

I'm trying to run a transaction but it has no effect:

...
RTransaction t(document.getStorage(), QObject::tr("Set Layer Properties"));
layer->setFrozen(false);
layer->setLocked(false);
t.addObject(layer, false);
t.end();
...

[andrew]

Transactions are usually only used on a lower level in QCAD (a transaction records all changes on a set of objects caused by an operation, i.e. when adding, deleting or modifying objects).

Operations are the concept used for more comfortable, higher level modifications:

RModifyObjectsOperation op;
op.addObject(layer);
di->applyOperation(&op);

This will update the document and also the views, layer lists, etc. accordingly. A transaction object is returned by applyOperation which contains information about objects that were changed.