[gnome-software/wip/mcrha/image-runtime-warning] gtk-style.css: Change margin for adaptive-symbolic icon

[Milan Crha <mcrha src gnome org>]

commit 5e1359bb0614415b998436611fe209b0d3c3a02d
Author: Milan Crha <mcrha redhat com>
Date:   Tue Oct 26 13:32:47 2021 +0200

    gtk-style.css: Change margin for adaptive-symbolic icon
    
    The margin is used to draw the icon rectangular, instead of square,
    but gtk4 claims a runtime warning due to too large margin:
    
    > Gtk GtkImage 0x889cf80 (image) reported min height -1942, but sizes must be >= 0
    
    where the -1942 = (-999) + (-999) + 56. It's not needed to use such large
    margin, especially when the code sets the image pixel size to 56, thus
    split the pixel size evenly in the margin.

 src/gtk-style.css | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/gtk-style.css b/src/gtk-style.css
index 1cf09f6bd..b15262566 100644
--- a/src/gtk-style.css
+++ b/src/gtk-style.css
@@ -744,8 +744,8 @@ app-context-bar.vertical box:not(:last-child) .context-tile {
         * use this hack to make it zero-height and vertically centred. The
         * vertical size group ensures that it does still actually have a
         * height. */
-       margin-top: -999px;
-       margin-bottom: -999px;
+       margin-top: -28px;
+       margin-bottom: -28px;
 }
 
 .context-tile-title { font-weight: bold; }