Diff: Dont highlight errors

apps/lib/diff/diffeditor.cpp

@@ -13,6 +13,15 @@
 #include <QTextBlock>
 
 #include <KLocalizedString>
+#include <KSyntaxHighlighting/Format>
+
+void DiffSyntaxHighlighter::applyFormat(int offset, int length, const KSyntaxHighlighting::Format &format)
+{
+    if (format.textStyle() == KSyntaxHighlighting::Theme::TextStyle::Error) {
+        return;
+    }
+    KSyntaxHighlighting::SyntaxHighlighter::applyFormat(offset, length, format);
+}
 
 DiffEditor::DiffEditor(DiffParams::Flags f, QWidget *parent)
     : QPlainTextEdit(parent)

apps/lib/diff/diffeditor.h

@@ -9,6 +9,21 @@
 #include <KTextEditor/Range>
 #include <QPlainTextEdit>
 
+#include <KSyntaxHighlighting/FoldingRegion>
+#include <KSyntaxHighlighting/SyntaxHighlighter>
+
+class DiffSyntaxHighlighter final : public KSyntaxHighlighting::SyntaxHighlighter
+{
+public:
+    using KSyntaxHighlighting::SyntaxHighlighter::SyntaxHighlighter;
+    void applyFormat(int offset, int length, const KSyntaxHighlighting::Format &format) override;
+
+    void applyFolding(int, int, KSyntaxHighlighting::FoldingRegion) override
+    {
+        // no folding
+    }
+};
+
 #if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
 using IntT = qsizetype;
 #else

apps/lib/diff/diffwidget.cpp

@@ -22,7 +22,6 @@
 #include <KSyntaxHighlighting/Definition>
 #include <KSyntaxHighlighting/Format>
 #include <KSyntaxHighlighting/Repository>
-#include <KSyntaxHighlighting/SyntaxHighlighter>
 
 DiffWidget::DiffWidget(DiffParams p, QWidget *parent)
     : QWidget(parent)
@@ -34,8 +33,8 @@ DiffWidget::DiffWidget(DiffParams p, QWidget *parent)
     layout->addWidget(m_left);
     layout->addWidget(m_right);
 
-    leftHl = new KSyntaxHighlighting::SyntaxHighlighter(m_left->document());
-    rightHl = new KSyntaxHighlighting::SyntaxHighlighter(m_right->document());
+    leftHl = new DiffSyntaxHighlighter(m_left->document());
+    rightHl = new DiffSyntaxHighlighter(m_right->document());
     leftHl->setTheme(KTextEditor::Editor::instance()->theme());
     rightHl->setTheme(KTextEditor::Editor::instance()->theme());