add shortcut Escape button for closing images issues 672

src/dialogs/ImageOverlay.cpp

@@ -31,6 +31,8 @@ ImageOverlay::ImageOverlay(QPixmap image, QWidget *parent)
 
         connect(this, SIGNAL(closing()), this, SLOT(close()));
 
+        close_shortcut_ = new QShortcut(QKeySequence(Qt::Key_Escape), this, SLOT(close()));
+
         raise();
 }
 

src/dialogs/ImageOverlay.h

@@ -8,6 +8,7 @@
 #include <QDialog>
 #include <QMouseEvent>
 #include <QPixmap>
+#include <QShortcut>
 
 namespace dialogs {
 
@@ -32,5 +33,6 @@ private:
         QRect content_;
         QRect close_button_;
         QRect save_button_;
+        QShortcut *close_shortcut_;
 };
 } // dialogs