adjust font vertical position by baseline offset

src/gui/Font.h

@@ -12,6 +12,7 @@ public:
     std::shared_ptr<Glyph> get_glyph(FT_ULong character);
     int get_advance() { return m_advance; }
     int get_line_height() { return m_line_height; }
+    int get_baseline_offset() { return m_baseline_offset; }
 
 protected:
     bool preload_glyphs();

src/gui/Window.cc

@@ -298,7 +298,7 @@ void Window::redraw()
         {
             uint8_t c = piece->start[i];
             auto g = m_font.get_glyph(c);
-            m_shaders.text->set_position(x, y);
+            m_shaders.text->set_position(x, y + m_font.get_baseline_offset());
             g->render();
             if ((i + 1) % m_columns == 0)
             {