Drop o3tl::optional wrapper

...now that macOS builds are guaranteed to have std::optional since
358146bbbd1b9775c12770fb5e497b6ec5adfc51 "Bump macOS build baseline to
Xcode 11.3 and macOS 10.14.4".

The change is done mostly mechanically with

> for i in $(git grep -Fl optional); do
>  sed -i -e 's:<o3tl/optional\.hxx>\|\"o3tl/optional\.hxx\":<optional>:' \
>   -e 's/\<o3tl::optional\>/std::optional/g' \
>   -e 's/\<o3tl::make_optional\>/std::make_optional/g' "$i"
> done
> for i in $(git grep -Flw o3tl::nullopt); do
>  sed -i -e 's/\<o3tl::nullopt\>/std::nullopt/g' "$i"
> done

(though that causes some of the resulting

#include <optional>

to appear at different places relative to other includes than if they had been
added manually), plus a few manual modifications:

* adapt bin/find-unneeded-includes
* adapt desktop/IwyuFilter_desktop.yaml
* remove include/o3tl/optional.hxx
* quote resulting "<"/">" as "&lt;"/"&gt;" in officecfg/registry/cppheader.xsl
* and then solenv/clang-format/reformat-formatted-files

Change-Id: I68833d9f7945e57aa2bc703349cbc5a56b342273
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/89165
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/sw/source/ui/misc/titlepage.cxx b/sw/source/ui/misc/titlepage.cxx
index 3e264f5bb0a4..26fa4bdeb564 100644
--- a/sw/source/ui/misc/titlepage.cxx
+++ b/sw/source/ui/misc/titlepage.cxx
@@ -28,7 +28,7 @@ namespace
             const SfxPoolItem* pItem(nullptr);
             if (SfxItemState::SET == aSet.GetItemState( RES_PAGEDESC, true, &pItem ) && pItem)
             {
-                ::o3tl::optional<sal_uInt16> oNumOffset = static_cast<const SwFormatPageDesc *>(pItem)->GetNumOffset();
+                ::std::optional<sal_uInt16> oNumOffset = static_cast<const SwFormatPageDesc *>(pItem)->GetNumOffset();
                 if (oNumOffset)
                     rPageNo = *oNumOffset;
                 if (ppPageFormatDesc)
@@ -59,7 +59,7 @@ namespace
         {
             if (pPageFormatDesc)
             {
-                ::o3tl::optional<sal_uInt16> oNumOffset = pPageFormatDesc->GetNumOffset();
+                ::std::optional<sal_uInt16> oNumOffset = pPageFormatDesc->GetNumOffset();
                 if (oNumOffset)
                 {
                     nPgNo = *oNumOffset;