Fix bug 375007 - Asserts when pressing "Show Imports" button in problems tool…

Authored by antonanikin on Jan 16 2017, 9:24 AM.

Description

Fix bug 375007 - Asserts when pressing "Show Imports" button in problems tool view

Summary: Fix asserts by adding missing DUChainReadLocker to KDevelop::WatchedDocumentSetPrivate::getImportsFromDUChain.

Test Plan: tested on master branch

Reviewers: KDevelop, kfunk

Reviewed By: KDevelop, kfunk

Subscribers: kdevelop-devel

Differential Revision: https://phabricator.kde.org/D4152