diff --git a/src/plugins/texteditor/textdocument.cpp b/src/plugins/texteditor/textdocument.cpp
index 7fcfe5c86c2..63cd2b170e9 100644
--- a/src/plugins/texteditor/textdocument.cpp
+++ b/src/plugins/texteditor/textdocument.cpp
@@ -10,6 +10,7 @@
 #include "tabsettings.h"
 #include "textdocumentlayout.h"
 #include "texteditor.h"
+#include "texteditorconstants.h"
 #include "texteditorsettings.h"
 #include "texteditortr.h"
 #include "textindenter.h"
@@ -573,6 +574,9 @@ void TextDocument::setIfdefedOutBlocks(const QList<BlockRange> &blocks)
         }
 
         if (braceDepthDelta) {
+            qCDebug(Internal::foldingLog)
+                << "changing brace depth and folding indent by" << braceDepthDelta << "for line"
+                << (block.blockNumber() + 1) << "due to ifdefed out code";
             TextDocumentLayout::changeBraceDepth(block,braceDepthDelta);
             TextDocumentLayout::changeFoldingIndent(block, braceDepthDelta); // ### C++ only, refactor!
         }
diff --git a/src/plugins/texteditor/texteditor.cpp b/src/plugins/texteditor/texteditor.cpp
index d75db87a166..d865fcebe98 100644
--- a/src/plugins/texteditor/texteditor.cpp
+++ b/src/plugins/texteditor/texteditor.cpp
@@ -6339,6 +6339,13 @@ void TextEditorWidgetPrivate::paintCodeFolding(QPainter &painter,
     bool drawBox = nextBlockUserData
             && TextDocumentLayout::foldingIndent(data.block)
             < nextBlockUserData->foldingIndent();
+    if (drawBox) {
+        qCDebug(foldingLog) << "need to paint folding marker";
+        qCDebug(foldingLog) << "folding indent for line" << (data.block.blockNumber() + 1) << "is"
+                            << TextDocumentLayout::foldingIndent(data.block);
+        qCDebug(foldingLog) << "folding indent for line" << (nextBlock.blockNumber() + 1) << "is"
+                            << nextBlockUserData->foldingIndent();
+    }
 
     const int blockNumber = data.block.blockNumber();
     bool active = blockNumber == extraAreaHighlightFoldBlockNumber;
diff --git a/src/plugins/texteditor/texteditorconstants.cpp b/src/plugins/texteditor/texteditorconstants.cpp
index e6d157adca9..689669a91a6 100644
--- a/src/plugins/texteditor/texteditorconstants.cpp
+++ b/src/plugins/texteditor/texteditorconstants.cpp
@@ -125,4 +125,9 @@ TextStyle styleFromName(const char *name)
 }
 
 } // namespace Constants
+
+namespace Internal {
+Q_LOGGING_CATEGORY(foldingLog, "qtc.editor.folding", QtWarningMsg)
+} // namespace Internal
+
 } // namespace TextEditor
diff --git a/src/plugins/texteditor/texteditorconstants.h b/src/plugins/texteditor/texteditorconstants.h
index 2597deb6bba..04405438395 100644
--- a/src/plugins/texteditor/texteditorconstants.h
+++ b/src/plugins/texteditor/texteditorconstants.h
@@ -5,7 +5,7 @@
 
 #include "texteditor_global.h"
 
-#include <QtGlobal>
+#include <QLoggingCategory>
 
 namespace TextEditor {
 
@@ -250,4 +250,7 @@ const char BOOKMARKS_NEXT_ACTION[]        = "Bookmarks.Next";
 const unsigned COMPLETION_ASSIST_TOOLTIP_DELAY = 100;
 
 } // namespace Constants
+
+namespace Internal { Q_DECLARE_LOGGING_CATEGORY(foldingLog) }
+
 } // namespace TextEditor