[welcome] Make resultWidgets less error-prone

- instead of counting and needing to keep track of the predicate
   applied while creating the widgets, push nullptrs to the widget
   list instead reflecting "this entry did not satisfy the predicate
   for widget creation".

src/modules/welcome/checker/ResultsListWidget.cpp

@@ -34,16 +34,29 @@
 #include <QLabel>
 #include <QVBoxLayout>
 
+/** @brief Add widgets to @p layout for the list @p checkEntries
+ * 
+ * The @p resultWidgets is filled with pointers to the widgets;
+ * for each entry in @p checkEntries that satisfies @p predicate,
+ * a widget is created, otherwise a nullptr is added instead.
+ * 
+ * Adds all the widgets to the given @p layout.
+ * 
+ * Afterwards, @p resultWidgets has a length equal to @p checkEntries.
+ */
 static void
 createResultWidgets( QLayout* layout,
                      QList< ResultWidget* >& resultWidgets,
                      const Calamares::RequirementsList& checkEntries,
                      std::function< bool( const Calamares::RequirementEntry& ) > predicate )
 {
+    resultWidgets.clear();
+    resultWidgets.reserve( checkEntries.count() );
     for ( const auto& entry : checkEntries )
     {
         if ( !predicate( entry ) )
         {
+            resultWidgets.append( nullptr );
             continue;
         }
 
@@ -127,11 +140,10 @@ ResultsListDialog::retranslate()
     int i = 0;
     for ( const auto& entry : m_entries )
     {
-        if ( !entry.hasDetails() )
+        if ( m_resultWidgets[ i ] )
         {
-            continue;
+            m_resultWidgets[ i ]->setText( entry.enumerationText() );
         }
-        m_resultWidgets[ i ]->setText( entry.enumerationText() );
         i++;
     }
 }
@@ -241,7 +253,7 @@ ResultsListWidget::ResultsListWidget( QWidget* parent, const Calamares::Requirem
     {
         mainLayout->addStretch();
     }
-    
+
     CALAMARES_RETRANSLATE_SLOT( &ResultsListWidget::retranslate )
     retranslate();
 }
@@ -264,11 +276,10 @@ ResultsListWidget::retranslate()
     int i = 0;
     for ( const auto& entry : m_entries )
     {
-        if ( entry.satisfied )
+        if ( m_resultWidgets[ i ] )
         {
-            continue;
+            m_resultWidgets[ i ]->setText( entry.negatedText() );
         }
-        m_resultWidgets[ i ]->setText( entry.negatedText() );
         i++;
     }
 }