Fix TreeTableContextClickTest to not scroll vertically on IE
Too wide TreeTable in a UI causes IE to scroll vertically making
calculated positions fail miserably. Also makes context clicking in
AbstractContextClickTest avoid StaleElementReferenceExceptions.
Change-Id: Ic4f5049bf0c221eb441813d202b9de5571e655d6
Tree connector now overrides the send context click event providing the
row key to the server-side via RPC call. This is then passed on to a
TreeContextClickEvent and fired to listeners.
This patch modifies the test base for context click testing by making it
tolerate 1 piksel differences. This was to fix any subpixel related
issues in coordinate comparison.
Change-Id: Iacced274a6b518b5f89378cbc32b8381362e1e4f