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/sc/source/ui/pagedlg/scuitphfedit.cxx b/sc/source/ui/pagedlg/scuitphfedit.cxx
index af74df3d718e..638ed247be6c 100644
--- a/sc/source/ui/pagedlg/scuitphfedit.cxx
+++ b/sc/source/ui/pagedlg/scuitphfedit.cxx
@@ -183,8 +183,8 @@ void ScHFEditPage::InitPreDefinedList()
 {
     SvtUserOptions aUserOpt;
 
-    o3tl::optional<Color> pTxtColour;
-    o3tl::optional<Color> pFldColour;
+    std::optional<Color> pTxtColour;
+    std::optional<Color> pFldColour;
 
     // Get the all field values at the outset.
     OUString aPageFieldValue(m_xWndLeft->GetEditEngine()->CalcFieldValue(SvxFieldItem(SvxPageField(), EE_FEATURE_FIELD), 0,0, pTxtColour, pFldColour));