tdf#130555: Prevent negative aSelection.Min()
...which would violate the the preconditions of the later call to maText.remove.
When BreakIteratorImpl::previousWord
(i18npool/source/breakiterator/breakiteratorImpl.cxx) is called to e.g. move
back over a single space at the start of the text, at least for an en-US locale
it will fall through to the call to BreakIterator_Unicode::previousWord
(i18npool/source/breakiterator/breakiterator_unicode.cxx) at the bottom of the
function. That in turn calls icu::BreakIterator::preceding, which is documented
(workdir/UnpackedTarball/icu/source/common/unicode/brkiter.h) to return
icu::BreakIterator::DONE (i.e., -1, see
workdir/UnpackedTarball/icu/source/common/unicode/brkiter.h) in that case, which
causes BreakIterator_Unicode::previousWord to return a Boundary with startPos ==
endPos == -1.
The documentation of UNO method css.i18n.XBreakIterator::previousWord
(offapi/com/sun/star/i18n/XBreakIterator.idl) is silent about the expected
return value in such a case. But lets assume that returning such a [-1..-1]
Boundary is as intended, and locally address this case in Edit::ImplDelete,
making aSelection start at the start of the text.
Change-Id: I40e17ba602088e72aa6962cb41dd8e1cdf6e2561
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/88431
Tested-by: Jenkins
Reviewed-by: Eike Rathke <erack@redhat.com>
diff --git a/vcl/source/control/edit.cxx b/vcl/source/control/edit.cxx
index 40c22f9..7045a0c 100644
--- a/vcl/source/control/edit.cxx
+++ b/vcl/source/control/edit.cxx
@@ -62,6 +62,7 @@
#include <o3tl/safeint.hxx>
#include <officecfg/Office/Common.hxx>
#include <algorithm>
#include <memory>
using namespace ::com::sun::star;
@@ -688,10 +689,14 @@ void Edit::ImplDelete( const Selection& rSelection, sal_uInt8 nDirection, sal_uI
{
i18n::Boundary aBoundary = xBI->getWordBoundary( maText.toString(), aSelection.Min(),
GetSettings().GetLanguageTag().getLocale(), i18n::WordType::ANYWORD_IGNOREWHITESPACES, true );
if ( aBoundary.startPos == aSelection.Min() )
auto startPos = aBoundary.startPos;
if ( startPos == aSelection.Min() )
{
aBoundary = xBI->previousWord( maText.toString(), aSelection.Min(),
GetSettings().GetLanguageTag().getLocale(), i18n::WordType::ANYWORD_IGNOREWHITESPACES );
aSelection.Min() = aBoundary.startPos;
startPos = std::max(aBoundary.startPos, sal_Int32(0));
}
aSelection.Min() = startPos;
}
else if ( nMode == EDIT_DELMODE_RESTOFCONTENT )
{
