found one more case where documentId can be null

…ng is in progress.

port of #12041 for microupdate

…sion-number

Update the Roslyn version to 1.3.2

This commit makes it so that we will always try to generate release nugets except if they depend on prerelease packages. If one of our nuget packages happens to depend on prerelease packages, then when building release nugets, we will simply print a message in the build output and skip release nuget generation for that package (and allow the overall build to succeed).

… instead of adding custom logic in the script for this.

…nuget packages.

Enable release nugets in microupdate-3.2 branch

this leak was responsible for about 14% of managed memory in customer's dump.

basically, in certain condition, if cancellation exception is thrown, we will not close difference viewer which cause
all text views to leak. that cause all taggers and text buffers to leak and that cause our preview workspaces to alive.
which in turn cause all solutions to alive and so on. all those objects (view, buffer, workspace, solution) are quite
big graphs. so ends up eat up 14% of memory.

added assert to make sure if we leak viewers again, we get some kind of notification.

fixed DifferenceViewer leak

…into-microupdate

Merge microupdate 3.2 into microupdate

… on VS2015.2

Skipping the InteractiveWindow Clipboard UnitTests as they cannot run on VS2015.2

# Conflicts:
#	build/Targets/VSL.Versions.targets
#	src/VisualStudio/Core/Def/Implementation/PreviewPane/PreviewPane.xaml.cs