Assertion with BATCH_outline-beamer test

[Kornel Benko]

The command:
 /BUILD/BUILDMint18/BuildLyxGitQt5.9.5local-gcc8.3.0/bin/lyx2.4 '-userdir'
 '/BUILD/BUILDMint18/BuildLyxGitQt5.9.5local-gcc8.3.0/Testing/.lyxbatch' '-platform'
 'offscreen' '-x' 'command-sequence file-open beamer_test.lyx;buffer-begin;repeat 150
 outline-down;repeat 150 outline-up;buffer-export pdflatex;buffer-reload dump;lyx-quit'

Result:
frontends/qt/GuiClipboard.cpp (71): 0 bytes (no QMimeData)
CursorSlice.cpp (111): Don't like 1, pos: 1 size: 0 par: 316
support/lassert.cpp (51): ASSERTION false VIOLATED
IN /usr2/src/lyx/lyx-git/src/CursorSlice.cpp:112
(  1) /BUILD/BUILDMint18/BuildLyxGitQt5.9.5local-gcc8.3.0/bin/lyx2.4:
lyx::doAssertWithCallstack(bool)
(  2) /BUILD/BUILDMint18/BuildLyxGitQt5.9.5local-gcc8.3.0/bin/lyx2.4: lyx::doAssert(char
const*, char const*, long)
(  3) /BUILD/BUILDMint18/BuildLyxGitQt5.9.5local-gcc8.3.0/bin/lyx2.4:
lyx::CursorSlice::setPitPos(long, long)
(  4) /BUILD/BUILDMint18/BuildLyxGitQt5.9.5local-gcc8.3.0/bin/lyx2.4:
lyx::Text::setCursorIntern(lyx::Cursor&, long, long, bool, bool)
(  5) /BUILD/BUILDMint18/BuildLyxGitQt5.9.5local-gcc8.3.0/bin/lyx2.4:
lyx::Text::setCursor(lyx::Cursor&, long, long, bool, bool)
(  6) /BUILD/BUILDMint18/BuildLyxGitQt5.9.5local-gcc8.3.0/bin/lyx2.4:
lyx::Text::dispatch(lyx::Cursor&, lyx::FuncRequest&)
...

Attached the commands to provoke the assert.
Looks like Jean-Marc would be happy to fix :)

	Kornel

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