Improving font icon.

Author: phase1geo

data/com.github.phase1geo.annotator.gresource.xml

@@ -44,6 +44,8 @@
         <file alias="image-crop-dark-symbolic.svg">images/icons/scalable/image-crop-dark-symbolic.svg</file>
         <file alias="eyedropper-symbolic.svg">images/icons/scalable/eyedropper-svgrepo-com.svg</file>
         <file alias="eyedropper-dark-symbolic.svg">images/icons/scalable/eyedropper-dark-svgrepo-com.svg</file>
+        <file alias="font-symbolic.svg">images/icons/scalable/font-symbolic.svg</file>
+        <file alias="font-dark-symbolic.svg">images/icons/scalable/font-dark-symbolic.svg</file>
 
         <file alias="sticker_data_encryption">images/icons/flat-color-icons/svg/data_encryption.svg</file>
         <file alias="sticker_factory_breakdown">images/icons/flat-color-icons/svg/factory_breakdown.svg</file>

data/images/icons/scalable/font-dark-symbolic.svg

@@ -685,13 +685,17 @@ public class CanvasToolbar : Box {
   private void create_fonts() {
 
     var mb = new MenuButton() {
-      icon_name    = "font-x-generic-symbolic",
+      icon_name    = "font-symbolic",
       tooltip_text = _( "Font Properties" ),
       has_frame    = false,
       popover      = new Popover()
     };
     mb.get_style_context().add_class( "color_chooser" );
 
+    _canvas.win.theme_changed.connect((dark_mode) => {
+      mb.icon_name = dark_mode ? "font-dark-symbolic" : "font-symbolic";
+    });
+
     _font_chooser = new FontChooserWidget() {
       margin_start  = 10,
       margin_end    = 10,