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>

6 files changed, 7 insertions, 7 deletions

diff --git a/libreofficekit/qa/gtktiledviewer/gtv-application-window.cxx b/libreofficekit/qa/gtktiledviewer/gtv-application-window.cxx
index fec03e046dc2..2ebaf0e49aec 100644
--- a/libreofficekit/qa/gtktiledviewer/gtv-application-window.cxx
+++ b/libreofficekit/qa/gtktiledviewer/gtv-application-window.cxx
@@ -24,7 +24,7 @@
 #include "gtv-lok-dialog.hxx"
 
 #include <boost/property_tree/json_parser.hpp>
-#include <o3tl/optional.hxx>
+#include <optional>
 
 namespace {
 
diff --git a/libreofficekit/qa/gtktiledviewer/gtv-calc-header-bar.cxx b/libreofficekit/qa/gtktiledviewer/gtv-calc-header-bar.cxx
index 43037b5059f5..ff6023d5a74f 100644
--- a/libreofficekit/qa/gtktiledviewer/gtv-calc-header-bar.cxx
+++ b/libreofficekit/qa/gtktiledviewer/gtv-calc-header-bar.cxx
@@ -19,7 +19,7 @@
 
 #include <map>
 #include <boost/property_tree/json_parser.hpp>
-#include <o3tl/optional.hxx>
+#include <optional>
 #include <o3tl/unreachable.hxx>
 
 namespace {
diff --git a/libreofficekit/qa/gtktiledviewer/gtv-lokdocview-signal-handlers.cxx b/libreofficekit/qa/gtktiledviewer/gtv-lokdocview-signal-handlers.cxx
index bcee979766f5..359b6ad20833 100644
--- a/libreofficekit/qa/gtktiledviewer/gtv-lokdocview-signal-handlers.cxx
+++ b/libreofficekit/qa/gtktiledviewer/gtv-lokdocview-signal-handlers.cxx
@@ -18,7 +18,7 @@
 #include "gtv-lok-dialog.hxx"
 
 #include <boost/property_tree/json_parser.hpp>
-#include <o3tl/optional.hxx>
+#include <optional>
 
 #include <iostream>
 
diff --git a/libreofficekit/qa/gtktiledviewer/gtv-main-toolbar.cxx b/libreofficekit/qa/gtktiledviewer/gtv-main-toolbar.cxx
index 25f7d7890fdb..f2b76c1a93e3 100644
--- a/libreofficekit/qa/gtktiledviewer/gtv-main-toolbar.cxx
+++ b/libreofficekit/qa/gtktiledviewer/gtv-main-toolbar.cxx
@@ -20,7 +20,7 @@
 #include <memory>
 
 #include <boost/property_tree/json_parser.hpp>
-#include <o3tl/optional.hxx>
+#include <optional>
 
 namespace {
 
diff --git a/libreofficekit/qa/gtktiledviewer/gtv-signal-handlers.cxx b/libreofficekit/qa/gtktiledviewer/gtv-signal-handlers.cxx
index 1b0233fee66c..dd601375a32c 100644
--- a/libreofficekit/qa/gtktiledviewer/gtv-signal-handlers.cxx
+++ b/libreofficekit/qa/gtktiledviewer/gtv-signal-handlers.cxx
@@ -20,7 +20,7 @@
 #include <vector>
 
 #include <boost/property_tree/json_parser.hpp>
-#include <o3tl/optional.hxx>
+#include <optional>
 
 void btn_clicked(GtkWidget* pButton, gpointer)
 {
@@ -89,7 +89,7 @@ void doPaste(GtkWidget* pButton, gpointer /*pItem*/)
         g_free(pTargets);
     }
 
-    o3tl::optional<GdkAtom> oTarget;
+    std::optional<GdkAtom> oTarget;
     std::string aTargetName;
 
     std::vector<std::string> aPreferredNames =
diff --git a/libreofficekit/qa/tilebench/tilebench.cxx b/libreofficekit/qa/tilebench/tilebench.cxx
index 8802cb83be4b..28b6bc54d915 100644
--- a/libreofficekit/qa/tilebench/tilebench.cxx
+++ b/libreofficekit/qa/tilebench/tilebench.cxx
@@ -23,7 +23,7 @@
 #include <LibreOfficeKit/LibreOfficeKit.hxx>
 
 #include <boost/property_tree/json_parser.hpp>
-#include <o3tl/optional.hxx>
+#include <optional>
 
 using namespace lok;