[gnome-control-center] Tooltips for the rotation buttons in Displays

[Michael Catanzaro <mcatanzaro src gnome org>]

commit ef72c19ebf8a5b26f7fda0bd724cd733609dd26f
Author: Elias Toivanen <eatoivan chem helsinki fi>
Date:   Thu Jan 29 16:41:10 2015 +0200

    Tooltips for the rotation buttons in Displays
    
    When rotating a screen, the user has to first select the kind of
    rotation and then press Apply. However, the meaning of the symbolic
    icons may not be clear before actually pressing one of them.
    
    This patch adds appropriate tooltips to the buttons so that the user has
    a textual clue about what is going to happen.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=743888

 panels/display/cc-display-panel.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/panels/display/cc-display-panel.c b/panels/display/cc-display-panel.c
index 87bc375..306d6e0 100644
--- a/panels/display/cc-display-panel.c
+++ b/panels/display/cc-display-panel.c
@@ -1992,6 +1992,7 @@ show_setup_dialog (CcDisplayPanel *panel)
                                                   GNOME_RR_ROTATION_90))
         {
           priv->rotate_left_button = gtk_toggle_button_new ();
+          gtk_widget_set_tooltip_text (priv->rotate_left_button, _("Rotate counterclockwise by 90\xc2\xb0"));
           if (rotation == GNOME_RR_ROTATION_90)
             gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (priv->rotate_left_button), TRUE);
           g_signal_connect (priv->rotate_left_button, "clicked",
@@ -2009,6 +2010,7 @@ show_setup_dialog (CcDisplayPanel *panel)
                                                   GNOME_RR_ROTATION_180))
         {
           priv->upside_down_button = gtk_toggle_button_new ();
+          gtk_widget_set_tooltip_text (priv->upside_down_button, _("Rotate by 180\xc2\xb0"));
           if (rotation == GNOME_RR_ROTATION_180)
             gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (priv->upside_down_button), TRUE);
           g_signal_connect (priv->upside_down_button, "clicked",
@@ -2026,6 +2028,7 @@ show_setup_dialog (CcDisplayPanel *panel)
                                                   GNOME_RR_ROTATION_270))
         {
           priv->rotate_right_button = gtk_toggle_button_new ();
+          gtk_widget_set_tooltip_text (priv->rotate_right_button, _("Rotate clockwise by 90\xc2\xb0"));
           if (rotation == GNOME_RR_ROTATION_270)
             gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (priv->rotate_right_button), TRUE);
           g_signal_connect (priv->rotate_right_button, "clicked",