signalIMDeleteSurrounding searches for the focused accessible object.
Since newly created accessible objects were not inheriting
the focus setting of their peer, the search returned nothing
until some event triggered the focus to be adjusted.

Change-Id: I92f980b4bbe741d8ce9196165eff51059c807a2b
Reviewed-on: https://gerrit.libreoffice.org/21002Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Justin Luth <justin_luth@sil.org>