Fix potential memory leak by adding a virtual destructor to AnchorVertex

The subclass AnchorVertexPair is allocated and passed around as pointers
to AnchorVertex, and placed in lists that are then later cleaned up via
qDeleteAll. This very likely results in memory leaks, as the compiler-
generated ~AnchorVertexPair destructor is never called.

Add a virtual destructor. Since there now is a vtable generated for
AnchorVertex, remove the m_type member (which is only used for string
generation in debug builds) and make toString virtual instead.

Change-Id: I2cf184c0b1da1bd59b056a0f696a0e5479d4cb4e
Fixes: QTBUG-84094
Coverity-Id: 218707
Pick-to: 5.15
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
Reviewed-by: Lars Knoll <lars.knoll@qt.io>

0 files changed, 0 insertions, 0 deletions