TextEditor: move setIfdefedOutBlocks to TextDocument

The location of the blocks to marked ifdefed out are not tied to a
specific editor instance, but just depend on the document content.

Change-Id: I837730dc00e1d6060dd46bbb2cfccbfa5f72e6ce
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/plugins/texteditor/textdocument.h

@@ -49,6 +49,7 @@ QT_END_NAMESPACE
 
 namespace TextEditor {
 
+class BlockRange;
 class CompletionAssistProvider;
 class ExtraEncodingSettings;
 class FontSettings;
@@ -103,6 +104,9 @@ public:
     void autoFormat(const QTextCursor &cursor);
     bool applyChangeSet(const Utils::ChangeSet &changeSet);
 
+    // the blocks list must be sorted
+    void setIfdefedOutBlocks(const QList<BlockRange> &blocks);
+
     TextMarks marks() const;
     bool addMark(TextMark *mark);
     TextMarks marksAt(int line) const;