[kcms] Sort grid view KCMs case insensitively

Since these KCMs can display user and distro provided content, we can't
ensure that everything will begin with a capital letter. Accordingly, we
should sort the grid case-insensitively to prevent the entries starting
with lowercase letters from being shunted to the end.

CCBUG: 404608

kcms/colors/colorsmodel.cpp

@@ -217,7 +217,9 @@ void ColorsModel::load()
         m_data.append(item);
     }
 
+    // Sort case-insensitively
     QCollator collator;
+    collator.setCaseSensitivity(Qt::CaseInsensitive);
     std::sort(m_data.begin(), m_data.end(), [&collator](const ColorsModelData &a, const ColorsModelData &b) {
         return collator.compare(a.display, b.display) < 0;
     });

kcms/cursortheme/kcmcursortheme.cpp

@@ -87,7 +87,8 @@ CursorThemeConfig::CursorThemeConfig(QObject *parent, const QVariantList &args)
 
     m_themeProxyModel = new SortProxyModel(this);
     m_themeProxyModel->setSourceModel(m_themeModel);
-    m_themeProxyModel->setFilterCaseSensitivity(Qt::CaseSensitive);
+    // sort ordering is already case-insensitive; match that for filtering too
+    m_themeProxyModel->setFilterCaseSensitivity(Qt::CaseInsensitive);
     m_themeProxyModel->sort(NameColumn, Qt::AscendingOrder);
 
     m_sizesModel = new QStandardItemModel(this);

kcms/cursortheme/xcursor/sortproxymodel.cpp

@@ -36,7 +36,7 @@ int SortProxyModel::compare(const QModelIndex &left, const QModelIndex &right, i
     QString first = model->data(left, role).toString();
     QString second = model->data(right, role).toString();
 
-    if (filterCaseSensitivity() == Qt::CaseSensitive) {
+    if (filterCaseSensitivity() == Qt::CaseInsensitive) {
         first = first.toLower();
         second = second.toLower();
     }

kcms/desktoptheme/themesmodel.cpp

@@ -216,7 +216,9 @@ void ThemesModel::load()
         }
     }
 
+    // Sort case-insensitively
     QCollator collator;
+    collator.setCaseSensitivity(Qt::CaseInsensitive);
     std::sort(m_data.begin(), m_data.end(), [&collator](const ThemesModelData &a, const ThemesModelData &b) {
         return collator.compare(a.display, b.display) < 0;
     });

kcms/icons/iconsmodel.cpp

@@ -25,6 +25,7 @@
 
 #include "iconsmodel.h"
 
+#include <QCollator>
 #include <QFileIconProvider>
 
 #include <KIconTheme>
@@ -141,8 +142,11 @@ void IconsModel::load()
         m_data.append(item);
     }
 
-    std::sort(m_data.begin(), m_data.end(), [](const IconsModelData &a, const IconsModelData &b) {
-        return a.display < b.display;
+    // Sort case-insensitively
+    QCollator collator;
+    collator.setCaseSensitivity(Qt::CaseInsensitive);
+    std::sort(m_data.begin(), m_data.end(), [&collator](const IconsModelData &a, const IconsModelData &b) {
+        return collator.compare(a.display, b.display) < 0;
     });
 
     endResetModel();

kcms/lookandfeel/kcm.cpp

@@ -174,7 +174,15 @@ void KCMLookandFeel::loadModel()
 {
     m_model->clear();
 
-    const QList<KPackage::Package> pkgs = availablePackages({"defaults", "layouts"});
+    QList<KPackage::Package> pkgs = availablePackages({"defaults", "layouts"});
+
+    // Sort case-insensitively
+    QCollator collator;
+    collator.setCaseSensitivity(Qt::CaseInsensitive);
+    std::sort(pkgs.begin(), pkgs.end(), [&collator](const KPackage::Package &a, const KPackage::Package &b) {
+        return collator.compare(a.metadata().name(), b.metadata().name()) < 0;
+    });
+
     for (const KPackage::Package &pkg : pkgs) {
         if (!pkg.metadata().isValid()) {
             continue;
@@ -225,7 +233,6 @@ void KCMLookandFeel::loadModel()
 
         m_model->appendRow(row);
     }
-    m_model->sort(0 /*column*/);
 
     // Model has been cleared so pretend the selected look and fell changed to force view update
     emit lookAndFeelSettings()->lookAndFeelPackageChanged();

kcms/style/stylesmodel.cpp

@@ -200,7 +200,9 @@ void StylesModel::load()
 
     m_data = styleData.values().toVector();
 
+    // Sort case-insensitively
     QCollator collator;
+    collator.setCaseSensitivity(Qt::CaseInsensitive);
     std::sort(m_data.begin(), m_data.end(), [&collator](const StylesModelData &a, const StylesModelData &b) {
         const QString aDisplay = !a.display.isEmpty() ? a.display : a.styleName;
         const QString bDisplay = !b.display.isEmpty() ? b.display : b.styleName;