D12039: Add more tab access functions

[Nathaniel Graham]

ngraham created this revision.
ngraham added reviewers: Dolphin, elvisangelaccio.
ngraham requested review of this revision.

REVISION SUMMARY
  These new functions to access the next and previous tabs are not used by anything yet, but it is envisioned that they would be useful for a variety of purposes--such as the "open path in new tab" feature from D11703 <https://phabricator.kde.org/D11703>

TEST PLAN
  Dolphin still compiled and runs; new code is not actually used anywhere

REPOSITORY
  R318 Dolphin

BRANCH
  more-tab-switching-functions (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D12039

AFFECTED FILES
  src/dolphintabwidget.cpp
  src/dolphintabwidget.h

To: ngraham, #dolphin, elvisangelaccio
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