colorspacechooser: implemented setting input color space

app/dialog/color/colorspacechooser.cpp

@@ -109,6 +109,11 @@ QString ColorSpaceChooser::look() const
   return look_combobox_->currentText();
 }
 
+void ColorSpaceChooser::set_input(const QString &s)
+{
+  input_combobox_->setCurrentText(s);
+}
+
 void ColorSpaceChooser::UpdateViews(const QString& s)
 {
   QString v = view_combobox_->currentText();

app/dialog/color/colorspacechooser.h

@@ -17,6 +17,8 @@ public:
   QString view() const;
   QString look() const;
 
+  void set_input(const QString& s);
+
 signals:
   void ColorSpaceChanged(const QString& input, const QString& display, const QString& view, const QString& look);