make sure we use ordered list of document/projectIds when creating checksum
make sure we set HasAllInformation when creating projectInfo

added unit test

If we read in bad data from disk, do not blindly use it as it may not be valid wrt the state of the project.

Fixes #13579
Fixes #13099

Fixes for tabbing and Narrator.

in Dev14 these options were persisted as booleans. They are now persisted as xml in Dev15.  The fix is to not have the persistence keys overlap, ensuring Dev14 will not try to deserialize Dev15 options and vice versa

Fixes #7660
Fixes internal bugs 112211, 136895, 224318, 235409

We have a number of bugs (listed above) that show features trying to
navigate to positions that are not within the bounds of the documents in
which they are navigating. I have not been able to figure out the common
root cause of this problem, but they all flow through the
VisualStudioDocumentNavigationService, so adding bounds checks there
should alleviate the symptoms (reported as crashes, hangs, and error
dialogs).

Fixes:#16106

Related to https://github.com/dotnet/roslyn/issues/15225

Fixes internal bug 297517

Allows the Console to use encodings not available out-of-the-box on
CoreCLR.

Fixes #10785

* fix EmitDefaultValue to not attempt to emit decimal constants.

* add IL verification and release verification

* added datetime test

Fixes #16172
Fixes #15429
Fixes internal bug 276905

We were incorrectly calling .ShowDialog() instead of .ShowModal(), and
.ShowModal() is the version that does the work of setting the dialog's
Owner based on the currently focused hwnd.

remove BaseDiagnosticIncrementalAnalyzer which was introduced for engine to switch between v1 and v2 engine on the fly for dogfooding

in another word, whenever cshtml file is changed, we will re-analyze backing cs file