[plasmalnf] Simplify showAll handling

- Only need the showAll parameter once, when passing in the list
   of themes to show.

src/modules/plasmalnf/PlasmaLnfPage.cpp

@@ -82,11 +82,11 @@ PlasmaLnfPage::setLnfPath( const QString& path )
 }
 
 void
-PlasmaLnfPage::setEnabledThemes(const ThemeInfoList& themes)
+PlasmaLnfPage::setEnabledThemes(const ThemeInfoList& themes, bool showAll )
 {
     m_enabledThemes = themes;
 
-    if ( m_showAll )
+    if ( showAll )
     {
         auto plasmaThemes = plasma_themes();
         for ( auto& installed_theme : plasmaThemes )
@@ -102,7 +102,9 @@ PlasmaLnfPage::setEnabledThemes(const ThemeInfoList& themes)
 void
 PlasmaLnfPage::setEnabledThemesAll()
 {
-    setEnabledThemes( plasma_themes() );
+    // Don't need to set showAll=true, because we're already passing in
+    // the complete list of installed themes.
+    setEnabledThemes( plasma_themes(), false );
 }
 
 void
@@ -113,13 +115,6 @@ PlasmaLnfPage::setPreselect( const QString& id )
         fillUi();
 }
 
-void
-PlasmaLnfPage::setShowAll(bool b)
-{
-    m_showAll = b;
-}
-
-
 void PlasmaLnfPage::updateThemeNames()
 {
     auto plasmaThemes = plasma_themes();

src/modules/plasmalnf/PlasmaLnfPage.h

@@ -46,14 +46,17 @@ public:
     explicit PlasmaLnfPage( QWidget* parent = nullptr );
 
     void setLnfPath( const QString& path );
-    /** @brief enable only the listed themes. */
-    void setEnabledThemes( const ThemeInfoList& themes );
+    /** @brief enable only the listed themes.
+     *
+     * Shows the listed @p themes with full information (e.g. screenshot).
+     * If @p showAll is true, then also show all installed themes
+     * not explicitly listed (without a screenshot).
+     */
+    void setEnabledThemes( const ThemeInfoList& themes, bool showAll );
     /** @brief enable all installed plasma themes. */
     void setEnabledThemesAll();
     /** @brief set which theme is to be preselected. */
     void setPreselect( const QString& id );
-    /** @brief set whether to show all themes, not just the listed ones. */
-    void setShowAll( bool b );
 
 signals:
     void plasmaThemeSelected( const QString& id );

src/modules/plasmalnf/PlasmaLnfViewStep.cpp

@@ -165,12 +165,11 @@ PlasmaLnfViewStep::setConfigurationMap( const QVariantMap& configurationMap )
     bool showAll( false );
     if ( configurationMap.contains( "showAll" ) && configurationMap.value( "showAll" ).type() == QVariant::Bool )
         showAll = configurationMap.value( "showAll" ).toBool();
-    m_widget->setShowAll( showAll );
 
     if ( configurationMap.contains( "themes" ) &&
         configurationMap.value( "themes" ).type() == QVariant::List )
     {
-        ThemeInfoList allThemes;
+        ThemeInfoList listedThemes;
         auto themeList = configurationMap.value( "themes" ).toList();
         // Create the ThemInfo objects for the listed themes; information
         // about the themes from Plasma (e.g. human-readable name and description)
@@ -179,14 +178,14 @@ PlasmaLnfViewStep::setConfigurationMap( const QVariantMap& configurationMap )
             if ( i.type() == QVariant::Map )
             {
                 auto iv = i.toMap();
-                allThemes.append( ThemeInfo( iv.value( "theme" ).toString(), iv.value( "image" ).toString() ) );
+                listedThemes.append( ThemeInfo( iv.value( "theme" ).toString(), iv.value( "image" ).toString() ) );
             }
             else if ( i.type() == QVariant::String )
-                allThemes.append( ThemeInfo( i.toString() ) );
+                listedThemes.append( ThemeInfo( i.toString() ) );
 
-        if ( allThemes.length() == 1 )
+        if ( listedThemes.length() == 1 )
             cDebug() << "WARNING: only one theme enabled in plasmalnf";
-        m_widget->setEnabledThemes( allThemes );
+        m_widget->setEnabledThemes( listedThemes, showAll );
     }
     else
         m_widget->setEnabledThemesAll();  // All of them