Locale: don't overwrite explicit choice

If the user selects a language from the dialog (by clicking 'change'),
then preserve that explicit choice even when clicking on another
location which would reset the language based on the installer-
language.

src/modules/locale/LocaleConfiguration.cpp

@@ -1,6 +1,7 @@
 /* === This file is part of Calamares - <http://github.com/calamares> ===
  *
  *   Copyright 2016, Teo Mrnjavac <teo@kde.org>
+ *   Copyright 2017, Adriaan de Groot <groot@kde.org>
  *
  *   Calamares is free software: you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
@@ -20,6 +21,8 @@
 #include <QLocale>
 
 LocaleConfiguration::LocaleConfiguration()
+    : explicit_lang( false )
+    , explicit_lc( false )
 {
 }
 

src/modules/locale/LocaleConfiguration.h

@@ -1,6 +1,7 @@
 /* === This file is part of Calamares - <http://github.com/calamares> ===
  *
  *   Copyright 2016, Teo Mrnjavac <teo@kde.org>
+ *   Copyright 2017, Adriaan de Groot <groot@kde.org>
  *
  *   Calamares is free software: you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
@@ -40,6 +41,10 @@ public:
             lc_telephone, lc_measurement, lc_identification;
     QString myLanguageLocaleBcp47;
     QMap< QString, QString > toMap();
+
+    // If the user has explicitly selected language (from the dialog)
+    // or numbers format, set these to avoid implicit changes to them.
+    bool explicit_lang, explicit_lc;
 };
 
 #endif // LOCALECONFIGURATION_H

src/modules/locale/LocalePage.cpp

@@ -172,6 +172,7 @@ LocalePage::LocalePage( QWidget* parent )
              !dlg->selectedLCLocale().isEmpty() )
         {
             m_selectedLocaleConfiguration.lang = dlg->selectedLCLocale();
+            m_selectedLocaleConfiguration.explicit_lang = true;
             this->updateLocaleLabels();
         }
 
@@ -201,6 +202,7 @@ LocalePage::LocalePage( QWidget* parent )
             m_selectedLocaleConfiguration.lc_telephone = dlg->selectedLCLocale();
             m_selectedLocaleConfiguration.lc_measurement = dlg->selectedLCLocale();
             m_selectedLocaleConfiguration.lc_identification = dlg->selectedLCLocale();
+            m_selectedLocaleConfiguration.explicit_lc = true;
 
             this->updateLocaleLabels();
         }
@@ -478,6 +480,27 @@ LocalePage::updateGlobalStorage()
                               location.region + '/' + location.zone } );
     }
 
-    m_selectedLocaleConfiguration = guessLocaleConfiguration();
+    // Preserve those settings that have been made explicit.
+    auto newLocale = guessLocaleConfiguration();
+    if ( !m_selectedLocaleConfiguration.isEmpty() &&
+         m_selectedLocaleConfiguration.explicit_lang )
+        newLocale.lang = m_selectedLocaleConfiguration.lang;
+    if ( !m_selectedLocaleConfiguration.isEmpty() &&
+         m_selectedLocaleConfiguration.explicit_lc )
+    {
+        newLocale.lc_numeric = m_selectedLocaleConfiguration.lc_numeric;
+        newLocale.lc_time = m_selectedLocaleConfiguration.lc_time;
+        newLocale.lc_monetary = m_selectedLocaleConfiguration.lc_monetary;
+        newLocale.lc_paper = m_selectedLocaleConfiguration.lc_paper;
+        newLocale.lc_name = m_selectedLocaleConfiguration.lc_name;
+        newLocale.lc_address = m_selectedLocaleConfiguration.lc_address;
+        newLocale.lc_telephone = m_selectedLocaleConfiguration.lc_telephone;
+        newLocale.lc_measurement = m_selectedLocaleConfiguration.lc_measurement;
+        newLocale.lc_identification = m_selectedLocaleConfiguration.lc_identification;
+    }
+    newLocale.explicit_lang = m_selectedLocaleConfiguration.explicit_lang;
+    newLocale.explicit_lc = m_selectedLocaleConfiguration.explicit_lc;
+
+    m_selectedLocaleConfiguration = newLocale;
     updateLocaleLabels();
 }