[gnome-tweak-tool] Show text in tooltip when label is ellipsized

[John Stowers <jstowers src gnome org>]

commit 7532ffc2289bc1fde91729e1f4cfa710cec0908d
Author: Robin Stocker <robin nibor org>
Date:   Sat Jul 13 14:29:24 2013 +0200

    Show text in tooltip when label is ellipsized
    
    This is the case for the long texts in the "Typing" section.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=704149

 gtweak/widgets.py |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)
---
diff --git a/gtweak/widgets.py b/gtweak/widgets.py
index 072081e..df44027 100644
--- a/gtweak/widgets.py
+++ b/gtweak/widgets.py
@@ -43,6 +43,14 @@ def build_label_beside_widget(txt, *widget, **kwargs):
         image.set_tooltip_text(tip)
         return image
 
+    def show_tooltip_when_ellipsized(label, x, y, keyboard_mode, tooltip):
+        layout = label.get_layout()
+        if layout.is_ellipsized():
+            tooltip.set_text(label.get_text())
+            return True
+        else:
+            return False
+
     if kwargs.get("hbox"):
         hbox = kwargs.get("hbox")
     else:
@@ -52,6 +60,8 @@ def build_label_beside_widget(txt, *widget, **kwargs):
     lbl = Gtk.Label(txt)
     lbl.props.ellipsize = Pango.EllipsizeMode.END
     lbl.props.xalign = 0.0
+    lbl.set_has_tooltip(True)
+    lbl.connect("query-tooltip", show_tooltip_when_ellipsized)
     hbox.pack_start(lbl, True, True, 0)
 
     if kwargs.get("info"):