diff --git a/src/plugins/bookmarks/bookmark.h b/src/plugins/bookmarks/bookmark.h
index dccb9eaf11c..41e116ad17e 100644
--- a/src/plugins/bookmarks/bookmark.h
+++ b/src/plugins/bookmarks/bookmark.h
@@ -59,6 +59,7 @@ public:
     void updateLineNumber(int lineNumber);
     void updateBlock(const QTextBlock &block);
     void removedFromEditor();
+    TextEditor::ITextMark::Priority priority() const { return TextEditor::ITextMark::LowPriority; }
 
     QString filePath() const;
     QString fileName() const;
diff --git a/src/plugins/debugger/breakpointmarker.h b/src/plugins/debugger/breakpointmarker.h
index 7e20ac1b0d0..ccbf951f72c 100644
--- a/src/plugins/debugger/breakpointmarker.h
+++ b/src/plugins/debugger/breakpointmarker.h
@@ -52,6 +52,8 @@ public:
     void updateBlock(const QTextBlock &);
     void removedFromEditor();
     void updateLineNumber(int lineNumber);
+    TextEditor::ITextMark::Priority priority() const { return TextEditor::ITextMark::NormalPriority; }
+
 private:
     BreakpointId m_id;
     friend class BreakHandler;
diff --git a/src/plugins/debugger/debuggerengine.cpp b/src/plugins/debugger/debuggerengine.cpp
index 18bf047ae32..3c6e210ce13 100644
--- a/src/plugins/debugger/debuggerengine.cpp
+++ b/src/plugins/debugger/debuggerengine.cpp
@@ -143,6 +143,7 @@ public:
     void updateLineNumber(int /*lineNumber*/) {}
     void updateBlock(const QTextBlock & /*block*/) {}
     void removedFromEditor() {}
+    TextEditor::ITextMark::Priority priority() const { return TextEditor::ITextMark::HighPriority; }
 };
 
 
diff --git a/src/plugins/debugger/disassembleragent.cpp b/src/plugins/debugger/disassembleragent.cpp
index 6047530fac2..fa8f91d2e03 100644
--- a/src/plugins/debugger/disassembleragent.cpp
+++ b/src/plugins/debugger/disassembleragent.cpp
@@ -78,6 +78,8 @@ public:
     void updateBlock(const QTextBlock & /*block*/) {}
     void removedFromEditor() {}
     void documentClosing() {}
+    TextEditor::ITextMark::Priority priority() const
+        { return TextEditor::ITextMark::HighPriority; }
 };
 
 class BreakpointMarker2 : public TextEditor::ITextMark
@@ -90,6 +92,8 @@ public:
     void updateBlock(const QTextBlock &) {}
     void removedFromEditor() {}
     void documentClosing() {}
+    TextEditor::ITextMark::Priority priority() const
+        { return TextEditor::ITextMark::NormalPriority; }
 
 private:
     QIcon m_icon;
diff --git a/src/plugins/debugger/sourceagent.cpp b/src/plugins/debugger/sourceagent.cpp
index 338fe55261b..0ac9aee6610 100644
--- a/src/plugins/debugger/sourceagent.cpp
+++ b/src/plugins/debugger/sourceagent.cpp
@@ -84,6 +84,8 @@ public:
     void updateBlock(const QTextBlock & /*block*/) {}
     void removedFromEditor() {}
     void documentClosing() {}
+    TextEditor::ITextMark::Priority priority() const
+        { return TextEditor::ITextMark::HighPriority; }
 };
 
 class SourceAgentPrivate
diff --git a/src/plugins/texteditor/basetextdocumentlayout.cpp b/src/plugins/texteditor/basetextdocumentlayout.cpp
index d0f99b48115..a7540edb363 100644
--- a/src/plugins/texteditor/basetextdocumentlayout.cpp
+++ b/src/plugins/texteditor/basetextdocumentlayout.cpp
@@ -378,6 +378,17 @@ void TextBlockUserData::setCodeFormatterData(CodeFormatterData *data)
     m_codeFormatterData = data;
 }
 
+void TextBlockUserData::addMark(ITextMark *mark)
+{
+    int i = 0;
+    for ( ; i < m_marks.size(); ++i) {
+        if (mark->priority() < m_marks.at(i)->priority())
+            break;
+    }
+    m_marks.insert(i, mark);
+}
+
+
 BaseTextDocumentLayout::BaseTextDocumentLayout(QTextDocument *doc)
     :QPlainTextDocumentLayout(doc) {
     lastSaveRevision = 0;
diff --git a/src/plugins/texteditor/basetextdocumentlayout.h b/src/plugins/texteditor/basetextdocumentlayout.h
index 8a2b640836e..493fb7a2389 100644
--- a/src/plugins/texteditor/basetextdocumentlayout.h
+++ b/src/plugins/texteditor/basetextdocumentlayout.h
@@ -80,7 +80,7 @@ public:
     ~TextBlockUserData();
 
     inline TextMarks marks() const { return m_marks; }
-    inline void addMark(ITextMark *mark) { m_marks += mark; }
+    void addMark(ITextMark *mark);
     inline bool removeMark(ITextMark *mark) { return m_marks.removeAll(mark); }
     inline bool hasMark(ITextMark *mark) const { return m_marks.contains(mark); }
     inline void clearMarks() { m_marks.clear(); }
diff --git a/src/plugins/texteditor/basetextmark.cpp b/src/plugins/texteditor/basetextmark.cpp
index 91ff0e82b68..2fd63de0d87 100644
--- a/src/plugins/texteditor/basetextmark.cpp
+++ b/src/plugins/texteditor/basetextmark.cpp
@@ -73,6 +73,11 @@ public:
     {
         m_parent->documentClosingFor(this);
     }
+
+    virtual Priority priority() const
+    {
+        return m_parent->priority();
+    }
 private:
     BaseTextMark *m_parent;
 };
diff --git a/src/plugins/texteditor/basetextmark.h b/src/plugins/texteditor/basetextmark.h
index abc357b5465..8bf7a4c0066 100644
--- a/src/plugins/texteditor/basetextmark.h
+++ b/src/plugins/texteditor/basetextmark.h
@@ -35,17 +35,13 @@
 #define BASETEXTMARK_H
 
 #include "texteditor_global.h"
-#include <QtCore/QObject>
+#include "itexteditor.h"
 
 QT_BEGIN_NAMESPACE
 class QIcon;
 class QTextBlock;
 QT_END_NAMESPACE
 
-namespace Core {
-class IEditor;
-}
-
 namespace TextEditor {
 
 class ITextMarkable;
@@ -83,6 +79,8 @@ public:
 
     void moveMark(const QString &filename, int line);
 
+    virtual TextEditor::ITextMark::Priority priority() const = 0;
+
 private slots:
     void init();
     void editorOpened(Core::IEditor *editor);
diff --git a/src/plugins/texteditor/itexteditor.h b/src/plugins/texteditor/itexteditor.h
index 3a52f6008ef..ca2d667577d 100644
--- a/src/plugins/texteditor/itexteditor.h
+++ b/src/plugins/texteditor/itexteditor.h
@@ -67,6 +67,16 @@ public:
     virtual void updateBlock(const QTextBlock &block) = 0;
     virtual void removedFromEditor() = 0;
     virtual void documentClosing() = 0;
+
+    // determine order on markers on the same line.
+    enum Priority
+    {
+        LowPriority,
+        NormalPriority,
+        HighPriority // shown on top.
+    };
+
+    virtual Priority priority() const = 0;
 };
 
 typedef QList<ITextMark *> TextMarks;