D28968: [KRichTextEdit] Make sure headings don't mess with undo stack

[Igor Poboiko]

poboiko created this revision.
poboiko added reviewers: Frameworks, dfaure.
Herald added a project: Frameworks.
poboiko requested review of this revision.

REVISION SUMMARY
  This patch ensures that everything related to headings is undoable
  with a single `Ctrl+Z`. It also adds tests for the following use cases
  (ensuring those are undoable with a single `undo` command):
  
  1. Make line a heading
  2. Creating a newline after a heading
  3. Merging a heading and non-heading line with `Delete` key
  4. The same, with `Backspace` key

TEST PLAN
  `make && ctest`

REPOSITORY
  R310 KTextWidgets

BRANCH
  heading-undo-stack (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D28968

AFFECTED FILES
  autotests/krichtextedittest.cpp
  src/widgets/krichtextedit.cpp

To: poboiko, #frameworks, dfaure
Cc: kde-frameworks-devel, LeGast00n, cblack, michaelh, ngraham, bruns
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