Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+# Legacy Framework
+
+`SFX` is the "old" framework, used for historical reasons.
+
+An attempt of documentation of this module is located in `[git:sfx2/doc]`.
+
+It contains base classes for document model, view and controller, used
+by "old" applications like `sw`, `sc`, `sd` (while "new" applications
+are based on the "new" UNO based framework in "framework").
+
+The SFX framework is based on dispatching slots identified by integers
+(`SlotIDs`) to `SfxShells`, and there is a dedicated IDL compiler (`svidl`)
+involved that generates C++ slot headers from SDI files in modules' `sdi/`
+subdirectory.
+
+Documentation about SFX dispatch, SDI etc.:
+<https://wiki.openoffice.org/wiki/Framework/Article/Implementation_of_the_Dispatch_API_In_SFX2>
+
+Document load/save code is maintained in `[git:sfx2/source/doc/docfile.cxx`]
+`SfxMedium` class, which handles all the twisty load and save corner cases.
+
+`[git:sfx2/source/appl/sfxhelp.cxx]` Start procedure for the online
+help viewer top level window; handling of help URL creation and
+dispatch.
+
+There are also some UNO services here that could really be implemented
+anywhere, e.g. the `DocumentProperties` or `DocumentMetadataAccess`.
+
+Notable files:
+`sfx2/source/dialog/backingwindow.cxx` `Startcenter` buttons and the corresponding event handler.