Add ITextMark::visible() to make ITextMarks not take any space

Change-Id: Ib07cdc5cbe9a26385f82e6a845d72f218de7b2a6
Reviewed-by: Tobias Hunger <tobias.hunger@nokia.com>

src/plugins/texteditor/basetexteditor.cpp

@@ -3797,6 +3797,8 @@ void BaseTextEditorWidget::extraAreaPaintEvent(QPaintEvent *e)
                 if (d->m_marksVisible) {
                     int xoffset = 0;
                     foreach (ITextMark *mark, userData->marks()) {
+                        if (!mark->visible())
+                            continue;
                         const int height = fmLineSpacing - 1;
                         const int width = int(.5 + height * mark->widthFactor());
                         const QRect r(xoffset, top, width, height);

src/plugins/texteditor/itexteditor.cpp

@@ -72,6 +72,10 @@ ITextMark::Priority ITextMark::priority() const
     return m_priority;
 }
 
+bool ITextMark::visible() const
+{
+    return true;
+}
 
 double ITextMark::widthFactor() const
 {

src/plugins/texteditor/itexteditor.h

@@ -77,6 +77,7 @@ public:
     void setIcon(const QIcon &icon);
     Priority priority() const;
     void setPriority(Priority prioriy);
+    virtual bool visible() const;
     virtual double widthFactor() const;
 
 private: