[eog] EogThumbNav: Fix deprecated min-slider-length CSS attribute

[Felix Riemann <friemann src gnome org>]

commit b51b09964516ac3ef8845f1727d5ffc44c1aed49
Author: Felix Riemann <friemann gnome org>
Date:   Sat Oct 8 19:03:05 2016 +0200

    EogThumbNav: Fix deprecated min-slider-length CSS attribute
    
    GTK+ deprecated and ignored the attribute during the 3.20 cycle.
    This replaces it with the min-width attribute, but requires
    a slightly newer minimum GTK+ version.

 configure.ac |    2 +-
 data/eog.css |    5 ++++-
 2 files changed, 5 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 49a2144..c530007 100644
--- a/configure.ac
+++ b/configure.ac
@@ -85,7 +85,7 @@ YELP_HELP_INIT
 # GNOME Libs
 # **********
 
-GTK_REQUIRED=3.19.3
+GTK_REQUIRED=3.19.11
 GLIB_REQUIRED=2.42.0
 GNOME_DESKTOP_REQUIRED=2.91.2
 GDKPIXBUF_REQUIRED=2.30.0
diff --git a/data/eog.css b/data/eog.css
index 64af311..7979529 100644
--- a/data/eog.css
+++ b/data/eog.css
@@ -3,7 +3,10 @@
        -GtkScrollbar-has-secondary-backward-stepper: false;
        -GtkScrollbar-has-forward-stepper: false;
        -GtkScrollbar-has-secondary-forward-stepper: false;
-       -GtkScrollbar-min-slider-length: 60;
+}
+
+#eog-image-gallery-scrollbar.horizontal slider {
+       min-width: 60px;
 }
 
 #eog-sidebar-title {