view: Fix page background rendering while loading

origin commit:
https://git.gnome.org/browse/evince/commit/?h=gnome-3-8&id=38528f9

Author: Carlos Garcia Campos

libview/ev-view.c

@@ -105,6 +105,7 @@ typedef struct {
 #define SCROLL_TIME 150
 
 #define EV_STYLE_CLASS_DOCUMENT_PAGE "document-page"
+#define EV_STYLE_CLASS_INVERTED      "inverted"
 
 /*** Scrolling ***/
 static void       view_update_range_and_current_page         (EvView             *view);
@@ -5801,10 +5802,13 @@ draw_one_page (EvView       *view,
 
 	gtk_style_context_save (context);
 	gtk_style_context_add_class (context, EV_STYLE_CLASS_DOCUMENT_PAGE);
+	if (ev_document_model_get_inverted_colors (view->model))
+		gtk_style_context_add_class (context, EV_STYLE_CLASS_INVERTED);
 
 	if (view->continuous && page == current_page)
 		gtk_style_context_set_state (context, GTK_STATE_FLAG_ACTIVE);
 
+	gtk_render_background (context, cr, page_area->x, page_area->y, page_area->width, page_area->height);
 	gtk_render_frame (context, cr, page_area->x, page_area->y, page_area->width, page_area->height);
 	gtk_style_context_restore (context);
 

shell/atril.css

@@ -10,6 +10,7 @@
 }
 
 evview.document-page {
+    background-color: white;
     border-color: black;
     border-style: solid;
     border-width: 1px;
@@ -19,6 +20,7 @@ evview.document-page {
 }
 
 evview.document-page:active {
+    background-color: white;
     border-color: @theme_selected_bg_color;
     border-style: solid;
     border-width: 1px;
@@ -27,6 +29,10 @@ evview.document-page:active {
     padding: 0;
 }
 
+evview.document-page.inverted {
+    background-color: black;
+}
+
 evpresentationview {
     background-color: black;
 }