Gtk3 BlackMATE: more panel adjustments

- style system-monitor applet
- set icon-padding for na-tray-applet
- adjust hide panel buttons
- don't draw a bg on icons in na-tray-applet
  fixes https://github.com/mate-desktop/mate-panel/issues/336

2 files changed, 174 insertions, 0 deletions

diff --git a/desktop-themes/BlackMATE/gtk-3.0/assets/Makefile.am b/desktop-themes/BlackMATE/gtk-3.0/assets/Makefile.am
index 9e9f15bc..d3b8a268 100644
--- a/desktop-themes/BlackMATE/gtk-3.0/assets/Makefile.am
+++ b/desktop-themes/BlackMATE/gtk-3.0/assets/Makefile.am
@@ -38,6 +38,7 @@ theme_DATA = \
 	pane-separator-grip.svg \
 	pane-separator-grip-vertical-hover.svg \
 	pane-separator-grip-vertical.svg \
+	panel-grid.svg \
 	primary-toolbar-button-active-border-dark.svg \
 	primary-toolbar-raised-button-border-dark.svg \
 	progressbar-border-dark.svg \
diff --git a/desktop-themes/BlackMATE/gtk-3.0/assets/panel-grid.svg b/desktop-themes/BlackMATE/gtk-3.0/assets/panel-grid.svg
new file mode 100644
index 00000000..c057ca53
--- /dev/null
+++ b/desktop-themes/BlackMATE/gtk-3.0/assets/panel-grid.svg
@@ -0,0 +1,173 @@
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