D14140: Fix selecting a favorite that is filtered out in the foldertreeview.

[David Faure]

dfaure created this revision.
dfaure added reviewers: vkrause, dvratil, mlaurent.
Restricted Application added a project: KDE PIM.
Restricted Application edited subscribers, added: kde-pim; removed: KDE PIM.
dfaure requested review of this revision.

REVISION SUMMARY
  Adapt to the messagelib commit that requires a modelindex in
  Pane::setCurrentFolder.
  
  Also avoid calling setCurrentFolder twice when selecting a favorite
  (once because the favorite selection changed, and once again because the
  foldertreeview selection changed). This issue was pre-existing but
  wasn't visible because it didn't populate the messagelist or created new
  tabs.

TEST PLAN
  Same as https://phabricator.kde.org/D14139.

REPOSITORY
  R206 KMail

BRANCH
  Applications/18.04

REVISION DETAIL
  https://phabricator.kde.org/D14140

AFFECTED FILES
  src/kmmainwidget.cpp

To: dfaure, vkrause, dvratil, mlaurent
Cc: kde-pim, dvasin, rodsevich, winterz, vkrause, mlaurent, knauss, dvratil
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