[evolution] Bug 793582 - Add Column dialog doesn't work with dark themes

[Milan Crha <mcrha src gnome org>]

commit 2426d91d306af292f2ad58afb67ea93eb19e448b
Author: Milan Crha <mcrha redhat com>
Date:   Wed Feb 21 18:21:09 2018 +0100

    Bug 793582 - Add Column dialog doesn't work with dark themes

 src/e-util/e-table-field-chooser-item.c |   17 +++++++++++++++++
 1 files changed, 17 insertions(+), 0 deletions(-)
---
diff --git a/src/e-util/e-table-field-chooser-item.c b/src/e-util/e-table-field-chooser-item.c
index a63167f..01622e7 100644
--- a/src/e-util/e-table-field-chooser-item.c
+++ b/src/e-util/e-table-field-chooser-item.c
@@ -494,6 +494,7 @@ etfci_draw (GnomeCanvasItem *item,
             gint height)
 {
        ETableFieldChooserItem *etfci = E_TABLE_FIELD_CHOOSER_ITEM (item);
+       GtkStyleContext *style_context;
        GnomeCanvas *canvas = item->canvas;
        gint rows;
        gint y1, y2;
@@ -502,6 +503,12 @@ etfci_draw (GnomeCanvasItem *item,
        if (etfci->combined_header == NULL)
                return;
 
+       style_context = gtk_widget_get_style_context (GTK_WIDGET (canvas));
+
+       gtk_style_context_save (style_context);
+       gtk_style_context_add_class (style_context, GTK_STYLE_CLASS_VIEW);
+       gtk_style_context_add_class (style_context, GTK_STYLE_CLASS_HEADER);
+
        rows = e_table_header_count (etfci->combined_header);
 
        y1 = y2 = 0;
@@ -533,6 +540,8 @@ etfci_draw (GnomeCanvasItem *item,
 
                cairo_restore (cr);
        }
+
+       gtk_style_context_restore (style_context);
 }
 
 static GnomeCanvasItem *
@@ -567,6 +576,7 @@ etfci_start_drag (ETableFieldChooserItem *etfci,
                   gdouble y)
 {
        GtkWidget *widget = GTK_WIDGET (GNOME_CANVAS_ITEM (etfci)->canvas);
+       GtkStyleContext *style_context;
        GtkTargetList *list;
        GdkDragContext *context;
        ETableCol *ecol;
@@ -607,6 +617,12 @@ etfci_start_drag (ETableFieldChooserItem *etfci,
                etfci->width, button_height);
        cr = cairo_create (cs);
 
+       style_context = gtk_widget_get_style_context (widget);
+
+       gtk_style_context_save (style_context);
+       gtk_style_context_add_class (style_context, GTK_STYLE_CLASS_VIEW);
+       gtk_style_context_add_class (style_context, GTK_STYLE_CLASS_HEADER);
+
        e_table_header_draw_button (
                cr, ecol,
                widget, 0, 0,
@@ -614,6 +630,7 @@ etfci_start_drag (ETableFieldChooserItem *etfci,
                etfci->width, button_height,
                E_TABLE_COL_ARROW_NONE);
 
+       gtk_style_context_restore (style_context);
        gtk_drag_set_icon_surface (context, cs);
 
        cairo_surface_destroy (cs);