Starting a debug build of Calc, and using it (e.g., pressing F11), produces sequences of these three warnings in console:

> warn:sfx.control:3708:9032:sfx2/source/control/dispatch.cxx:1206: Childwindow slot missing: 25917
> warn:sfx.control:3708:9032:sfx2/source/control/dispatch.cxx:1206: Childwindow slot missing: 26189
> warn:sfx.control:3708:9032:sfx2/source/control/dispatch.cxx:1206: Childwindow slot missing: 26190

These three warnings refer to the last (at the time of filing the bug) three registrations in ScTabViewShell::InitInterface_Impl:

>    GetStaticInterface()->RegisterChildWindow(ScCondFormatDlgWrapper::GetChildWindowId());
>    GetStaticInterface()->RegisterChildWindow(sc::SparklineDialogWrapper::GetChildWindowId());
>    GetStaticInterface()->RegisterChildWindow(sc::SparklineDataRangeDialogWrapper::GetChildWindowId());

where ScCondFormatDlgWrapper is implemented using WID_CONDFRMT_REF, and sc::SparklineDialogWrapper and sc::SparklineDataRangeDialogWrapper use SID_SPARKLINE_DIALOG and SID_SPARKLINE_DATA_RANGE_DIALOG respectively.

These three identifiers do not have any corresponding entries in SDI files; cf. to e.g. ScFourierAnalysisDialogWrapper, which SID_FOURIER_ANALYSIS_DIALOG indeed has entries in sc/sdi/scalc.sdi and sc/sdi/cellsh.sdi.

ScCondFormatDlgWrapper line was added in commit 2b5915da481990fd6ea272104215d82b6fbf5dbb;
sc::SparklineDialogWrapper - in commit c61aa2dea120cc083f3cd51f0347284f47a9d566, and sc::SparklineDataRangeDialogWrapper - in commit a08f9ed2341bc60faae6b86538661fea40417ace.

I am not quite sure how much of a problem this noise is, but it seems at least inconsistent, compared to the other 43 elements that get the respective slots in SfxDispatcher::Update_Impl_ for the same interface.