"Professional CMake" book suggest the following:
"Targets should build successfully with or without compiler support for precompiled headers. It
should be considered an optimization, not a requirement. In particular, do not explicitly include a
precompile header (e.g. stdafx.h) in the source code, let CMake force-include an automatically
generated precompile header on the compiler command line instead. This is more portable across
the major compilers and is likely to be easier to maintain. It will also avoid warnings being
generated from certain code checking tools like iwyu (include what you use)."
Therefore, removed the "#include <PreCompiled.h>" from sources, also
there is no need for the "#ifdef _PreComp_" anymore
Introduce a new concept of transaction ID. Each transaction must be
unique inside the document. Multiple transactions from different
documents can be grouped together with the same transaction ID.
This makes it possible to undo/redo single operation that contains
changes from multiple documents due to external linking.
Application:
* get/set/closeActiveTransaction() is used to setup potential
transactions with a given name. The transaction is only created when
there is actual changes. If objects from multiple documents are
changed under the same active transaction, they will have the same
trasnaction ID, and can be undo/redo togtether later.
* signalUndo/signalRedo, new signals triggered once after an undo/redo
operation. Unlike signalUndo/RedoDocument, these signals will only be
triggered once even if there may be multiple documents involved during
undo/redo.
* signal(Before)CloseTransaction, new signals triggered before/after an
actual transaction is created or aborted.
AutoTransaction:
* Helper class to enable automatic management of transactions. See class
document for more details. This class will be used by Gui::Command
in later patches to allow better automation of transactions in
command.
Document:
* open/commit/abortTransaction() are now redirected to call
Application::get/set/closeActiveTransaction() instead.
* _openTransaction() is added to do the real creation of transaction.
* _checkTransaction() is modified to create transaction on actual change
of any property.
* getTransactionID() is used to find out the position of a transaction
with a given ID. When triggering undo in external document, it may be
necessary to perform multi-step undo/redo in order to match for the
transaction ID.
Transaction/TransactionObject:
* Various changes for the new transaction ID concept.
* Support undo/redo add/remove dynamic property
+ reimplment addDynamicProperty and removeDynamicProperty in TransactionalObject to raise exceptions
+ move addProperty, removeProperty and supportedProperties from ViewProviderPythonFeaturePy to ViewProviderPy
