sw: restore UI language to en while saving

Because the XML writer used in sw invokes the
translation logic, which uses the UI language,
saving can fail in case there are multiple
views with different langauges. This restores
the language used for loading before saving
to avoid such issues.

Signed-off-by: Ashod Nakashian <ashod.nakashian@collabora.co.uk>
Change-Id: I6675204bb68ea33b1395c779a64ab3e9b339d73e
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/135482
Tested-by: Jenkins CollaboraOffice <jenkinscollaboraoffice@gmail.com>
Reviewed-by: Michael Meeks <michael.meeks@collabora.com>
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/137547

3 files changed, 45 insertions, 0 deletions

diff --git a/include/sfx2/lokhelper.hxx b/include/sfx2/lokhelper.hxx
index d5c3adbf9d95..d0ca34125354 100644
--- a/include/sfx2/lokhelper.hxx
+++ b/include/sfx2/lokhelper.hxx
@@ -72,6 +72,10 @@ public:
     static void setViewLanguage(int nId, const OUString& rBcp47LanguageTag);
     /// Set the default language for views.
     static void setDefaultLanguage(const OUString& rBcp47LanguageTag);
+    /// Get the language used by the loading view (used for all save operations).
+    static const LanguageTag & getLoadLanguage();
+    /// Set the language used by the loading view (used for all save operations).
+    static void setLoadLanguage(const OUString& rBcp47LanguageTag);
     /// Set the locale for the given view.
     static void setViewLocale(int nId, const OUString& rBcp47LanguageTag);
     /// Get the device form factor that should be used for a new view.
diff --git a/sfx2/source/doc/objstor.cxx b/sfx2/source/doc/objstor.cxx
index 7ccee4f3a970..cee35fc3443c 100644
--- a/sfx2/source/doc/objstor.cxx
+++ b/sfx2/source/doc/objstor.cxx
@@ -91,6 +91,7 @@
 #include <osl/file.hxx>
 #include <comphelper/scopeguard.hxx>
 #include <comphelper/lok.hxx>
+#include <i18nlangtag/languagetag.hxx>
 
 #include <sfx2/signaturestate.hxx>
 #include <sfx2/app.hxx>
@@ -102,6 +103,7 @@
 #include <sfx2/docfac.hxx>
 #include <appopen.hxx>
 #include <objshimp.hxx>
+#include <sfx2/lokhelper.hxx>
 #include <sfx2/strings.hrc>
 #include <sfx2/sfxsids.hrc>
 #include <sfx2/dispatch.hxx>
@@ -3190,6 +3192,37 @@ bool SfxObjectShell::SaveAsOwnFormat( SfxMedium& rMedium )
             pImpl->aBasicManager.storeLibrariesToStorage( xStorage );
         }
 #endif
+
+        if (comphelper::LibreOfficeKit::isActive())
+        {
+            // Because XMLTextFieldExport::ExportFieldDeclarations (called from SwXMLExport)
+            // calls SwXTextFieldMasters::getByName, which in turn maps property names by
+            // calling SwStyleNameMapper::GetTextUINameArray, which uses
+            // SvtSysLocale().GetUILanguageTag() to do the mapping, saving indirectly depends
+            // on the UI language. This is an unfortunate depenency. Here we use the loader's language.
+            const LanguageTag viewLanguage = comphelper::LibreOfficeKit::getLanguageTag();
+            const LanguageTag loadLanguage = SfxLokHelper::getLoadLanguage();
+
+            // Use the default language for saving and restore later if necessary.
+            bool restoreLanguage = false;
+            if (viewLanguage != loadLanguage)
+            {
+                restoreLanguage = true;
+                comphelper::LibreOfficeKit::setLanguageTag(loadLanguage);
+            }
+
+            // Restore the view's original language automatically and as necessary.
+            const ::comphelper::ScopeGuard aGuard(
+                [&viewLanguage, restoreLanguage]()
+                {
+                    if (restoreLanguage
+                        && viewLanguage != comphelper::LibreOfficeKit::getLanguageTag())
+                        comphelper::LibreOfficeKit::setLanguageTag(viewLanguage);
+                });
+
+            return SaveAs(rMedium);
+        }
+
         return SaveAs( rMedium );
     }
     else return false;
diff --git a/sfx2/source/view/lokhelper.cxx b/sfx2/source/view/lokhelper.cxx
index a8dc5b5bf3b7..100cb3595e46 100644
--- a/sfx2/source/view/lokhelper.cxx
+++ b/sfx2/source/view/lokhelper.cxx
@@ -69,6 +69,7 @@ int DisableCallbacks::m_nDisabled = 0;
 namespace
 {
 LanguageTag g_defaultLanguageTag("en-US", true);
+LanguageTag g_loadLanguageTag("en-US", true); //< The language used to load.
 LOKDeviceFormFactor g_deviceFormFactor = LOKDeviceFormFactor::UNKNOWN;
 }
 
@@ -275,6 +276,13 @@ void SfxLokHelper::setDefaultLanguage(const OUString& rBcp47LanguageTag)
     g_defaultLanguageTag = LanguageTag(rBcp47LanguageTag, true);
 }
 
+const LanguageTag& SfxLokHelper::getLoadLanguage() { return g_loadLanguageTag; }
+
+void SfxLokHelper::setLoadLanguage(const OUString& rBcp47LanguageTag)
+{
+    g_loadLanguageTag = LanguageTag(rBcp47LanguageTag, true);
+}
+
 void SfxLokHelper::setViewLanguage(int nId, const OUString& rBcp47LanguageTag)
 {
     SfxViewShellArr_Impl& rViewArr = SfxGetpApp()->GetViewShells_Impl();