[gnumeric] GUI: Restore bolding of active sheet tab

[Morten Welinder <mortenw src gnome org>]

commit 58a6fb0640036c6465af97ad1ca272d53527d175
Author: Morten Welinder <terra gnome org>
Date:   Sat Jan 29 13:28:34 2022 -0500

    GUI: Restore bolding of active sheet tab

 NEWS                |  1 +
 src/dialogs/wbcg.ui |  5 ++++-
 src/gnumeric.css    | 11 ++++++-----
 src/wbc-gtk.c       |  3 +++
 4 files changed, 14 insertions(+), 6 deletions(-)
---
diff --git a/NEWS b/NEWS
index a63c9f4eb..957f57207 100644
--- a/NEWS
+++ b/NEWS
@@ -7,6 +7,7 @@ Morten:
        * Many improvements to vertical toolbars.
        * Install appdata file in new location [#612]
        * Allow styling of cell extension indicators.
+       * Restore bolding of active sheet tab.
 
 --------------------------------------------------------------------------
 Gnumeric 1.12.51
diff --git a/src/dialogs/wbcg.ui b/src/dialogs/wbcg.ui
index d382656a4..fba5ae2c4 100644
--- a/src/dialogs/wbcg.ui
+++ b/src/dialogs/wbcg.ui
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<!-- Generated with glade 3.16.1 -->
+<!-- Generated with glade 3.22.2 -->
 <interface>
   <requires lib="gtk+" version="3.8"/>
   <object class="GtkWindow" id="toplevel">
@@ -192,6 +192,9 @@
                         <child type="tab">
                           <placeholder/>
                         </child>
+                        <style>
+                          <class name="sheets"/>
+                        </style>
                       </object>
                       <packing>
                         <property name="expand">True</property>
diff --git a/src/gnumeric.css b/src/gnumeric.css
index 5fda82dc4..df667ddf6 100644
--- a/src/gnumeric.css
+++ b/src/gnumeric.css
@@ -127,14 +127,14 @@ GnmItemBar:hover {
 /* ------------------------------------------------------------------------- */
 /* This GtkDrawingArea is the select-all button above the row buttons.  */
 
-GtkDrawingArea.button.all {
+GtkDrawingArea.button.all, widget.button.all {
 }
 
 /* ------------------------------------------------------------------------- */
 
 /* GnmNotebook is a fake notebook holding just the sheet tabs area */
 
-GnmNotebook {
+GnmNotebook, notebook.buttons {
   padding-top: 0;
   padding-bottom: 0;
 }
@@ -190,7 +190,8 @@ GocItem.object-size.rubber-band {
 /* ------------------------------------------------------------------------- */
 /* GnmNotebookButton is the sheet name buttons used to select sheets.  */
 
-GnmNotebookButton:active {
+GnmNotebookButton:active,
+notebook.buttons tab label {
   font-weight: bold;
 }
 
@@ -229,12 +230,12 @@ button:hover.itembar, button:hover.itembar * {
 
 
 /* Small padding between and around toolbars, but not double between */
-box > box > toolbar {
+box > box > toolbar.horizontal {
     padding-top: 1pt;
     padding-bottom: 0pt;
 }
 
-box > box:last-child > toolbar {
+box > box:last-child > toolbar.horizontal {
     padding-top: 1pt;
     padding-bottom: 1pt;
 }
diff --git a/src/wbc-gtk.c b/src/wbc-gtk.c
index 366c6f263..5d91a68e4 100644
--- a/src/wbc-gtk.c
+++ b/src/wbc-gtk.c
@@ -975,11 +975,14 @@ static void
 wbc_gtk_create_notebook_area (WBCGtk *wbcg)
 {
        GtkWidget *placeholder;
+       GtkStyleContext *context;
 
        wbcg->bnotebook = g_object_new (GNM_NOTEBOOK_TYPE,
                                        "can-focus", FALSE,
                                        NULL);
        g_object_ref (wbcg->bnotebook);
+       context = gtk_widget_get_style_context (GTK_WIDGET (wbcg->bnotebook));
+       gtk_style_context_add_class (context, "buttons");
 
        g_signal_connect_after (G_OBJECT (wbcg->bnotebook),
                "switch_page",