D8710: Fix VI-Mode buffer commands

[Christoph Roick]

croick created this revision.
croick added a reviewer: KTextEditor.
Restricted Application added projects: Kate, Frameworks.
Restricted Application added a subscriber: Frameworks.

REVISION SUMMARY
  - :tabclose currently makes kate crash.
  - Switching tabs with commands like :bp or :tabp only works once due to loss of focus. The user must click into the view to reactivate it.
  - Fix crash when switching documents with :b filename

TEST PLAN
  - use :tabclose to close a document
  - switch documents several times with :bp, :tabn, etc.
  - use :b filename to switch to corresponding tab

REPOSITORY
  R39 KTextEditor

BRANCH
  viedit

REVISION DETAIL
  https://phabricator.kde.org/D8710

AFFECTED FILES
  src/vimode/appcommands.cpp
  src/vimode/appcommands.h
  src/vimode/emulatedcommandbar/commandmode.cpp

To: croick, #ktexteditor
Cc: #frameworks, kevinapavew, ngraham, demsking, cullmann, sars, dhaumann
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