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/svx/source/svdraw/svdedxv.cxx b/svx/source/svdraw/svdedxv.cxx
index 2d0a58749e5e..91f7d2101139 100644
--- a/svx/source/svdraw/svdedxv.cxx
+++ b/svx/source/svdraw/svdedxv.cxx
@@ -1008,8 +1008,8 @@ IMPL_LINK(SdrObjEditView, ImpOutlinerCalcFieldValueHdl, EditFieldInfo*, pFI, voi
     SdrTextObj* pTextObj = mxTextEditObj.get();
     if (pTextObj != nullptr)
     {
-        o3tl::optional<Color> pTxtCol;
-        o3tl::optional<Color> pFldCol;
+        std::optional<Color> pTxtCol;
+        std::optional<Color> pFldCol;
         bOk = pTextObj->CalcFieldValue(pFI->GetField(), pFI->GetPara(), pFI->GetPos(), true,
                                        pTxtCol, pFldCol, rStr);
         if (bOk)