Avoid "Gtk-WARNING **: State doesn't match"

See https://github.com/wxWidgets/wxWidgets/pull/232
(backport of 69a13d973c)

src/gtk/control.cpp

@@ -251,6 +251,7 @@ wxControl::GetDefaultAttributesFromGTKWidget(GtkWidget* widget,
     }
     GtkStyleContext* sc = gtk_widget_get_style_context(widget);
     GdkRGBA c;
+    gtk_style_context_set_state(sc, stateFlag);
     gtk_style_context_get_color(sc, stateFlag, &c);
     attr.colFg = wxColour(c);
     gtk_style_context_get_background_color(sc, stateFlag, &c);

src/gtk/settings.cpp

@@ -155,33 +155,39 @@ static GtkWidget* ToolTipWidget()
 static void bg(GtkWidget* widget, GtkStateFlags state, GdkRGBA& gdkRGBA)
 {
     GtkStyleContext* sc = gtk_widget_get_style_context(widget);
+    gtk_style_context_set_state(sc, state);
     gtk_style_context_get_background_color(sc, state, &gdkRGBA);
     if (gdkRGBA.alpha <= 0)
     {
         widget = gtk_widget_get_parent(GTK_WIDGET(ContainerWidget()));
         sc = gtk_widget_get_style_context(widget);
+        gtk_style_context_set_state(sc, state);
         gtk_style_context_get_background_color(sc, state, &gdkRGBA);
     }
 }
 static void fg(GtkWidget* widget, GtkStateFlags state, GdkRGBA& gdkRGBA)
 {
     GtkStyleContext* sc = gtk_widget_get_style_context(widget);
+    gtk_style_context_set_state(sc, state);
     gtk_style_context_get_color(sc, state, &gdkRGBA);
     if (gdkRGBA.alpha <= 0)
     {
         widget = gtk_widget_get_parent(GTK_WIDGET(ContainerWidget()));
         sc = gtk_widget_get_style_context(widget);
+        gtk_style_context_set_state(sc, state);
         gtk_style_context_get_color(sc, state, &gdkRGBA);
     }
 }
 static void border(GtkWidget* widget, GtkStateFlags state, GdkRGBA& gdkRGBA)
 {
     GtkStyleContext* sc = gtk_widget_get_style_context(widget);
+    gtk_style_context_set_state(sc, state);
     gtk_style_context_get_border_color(sc, state, &gdkRGBA);
     if (gdkRGBA.alpha <= 0)
     {
         widget = gtk_widget_get_parent(GTK_WIDGET(ContainerWidget()));
         sc = gtk_widget_get_style_context(widget);
+        gtk_style_context_set_state(sc, state);
         gtk_style_context_get_border_color(sc, state, &gdkRGBA);
     }
 }
@@ -453,6 +459,7 @@ wxFont wxSystemSettingsNative::GetFont( wxSystemFont index )
                 wxNativeFontInfo info;
 #ifdef __WXGTK3__
                 GtkStyleContext* sc = gtk_widget_get_style_context(ButtonWidget());
+                gtk_style_context_set_state(sc, GTK_STATE_FLAG_NORMAL);
                 gtk_style_context_get(sc, GTK_STATE_FLAG_NORMAL,
                     GTK_STYLE_PROPERTY_FONT, &info.description, NULL);
 #else

src/gtk/spinbutt.cpp

@@ -196,7 +196,7 @@ wxSize wxSpinButton::DoGetBestSize() const
 #ifdef __WXGTK3__
     GtkStyleContext* sc = gtk_widget_get_style_context(m_widget);
     GtkBorder pad = { 0, 0, 0, 0 };
-    gtk_style_context_get_padding(sc, GtkStateFlags(0), &pad);
+    gtk_style_context_get_padding(sc, gtk_style_context_get_state(sc), &pad);
     best.x -= pad.left + pad.right;
 #else
     gtk_widget_ensure_style(m_widget);

src/gtk/textctrl.cpp

@@ -1828,6 +1828,7 @@ void wxTextCtrl::DoApplyWidgetStyle(GtkRcStyle *style)
             gtk_style_context_save(context);
             gtk_style_context_add_class(context, GTK_STYLE_CLASS_VIEW);
         }
+        gtk_style_context_set_state(context, selectedFocused);
         gtk_style_context_get_color(context, selectedFocused, &fg_orig);
         gtk_style_context_get_background_color(context, selectedFocused, &bg_orig);
         if (IsMultiLine())

src/gtk/win_gtk.cpp

@@ -452,6 +452,7 @@ void wxPizza::get_border(GtkBorder& border)
         else
             sc = gtk_widget_get_style_context(wxGTKPrivate::GetEntryWidget());
 
+        gtk_style_context_set_state(sc, GTK_STATE_FLAG_NORMAL);
         gtk_style_context_get_border(sc, GTK_STATE_FLAG_NORMAL, &border);
 #else // !__WXGTK3__
         GtkStyle* style;

src/gtk/window.cpp

@@ -304,6 +304,7 @@ draw_border(GtkWidget* widget, GdkEventExpose* gdk_event, wxWindow* win)
 #ifdef __WXGTK3__
         GtkStyleContext* sc = gtk_widget_get_style_context(win->m_wxwindow);
         GdkRGBA c;
+        gtk_style_context_set_state(sc, GTK_STATE_FLAG_NORMAL);
         gtk_style_context_get_border_color(sc, GTK_STATE_FLAG_NORMAL, &c);
         gdk_cairo_set_source_rgba(cr, &c);
         cairo_set_line_width(cr, 1);
@@ -4443,6 +4444,7 @@ void wxWindowGTK::GTKApplyStyle(GtkWidget* widget, GtkRcStyle* WXUNUSED_IN_GTK3(
     cairo_pattern_t* pattern = NULL;
     if (m_backgroundColour.IsOk())
     {
+        gtk_style_context_set_state(context, GTK_STATE_FLAG_NORMAL);
         gtk_style_context_get(context,
             GTK_STATE_FLAG_NORMAL, "background-image", &pattern, NULL);
     }