Auto update new upstream snapshot for GTK3

gtk/upstream/gtk-3.0/Mint-Y/sass/_applications.scss

@@ -842,7 +842,7 @@ MatePanelAppletFrameDBus > MatePanelAppletFrameDBus {
 
 // Xfce Panel
 .xfce4-panel.panel {
-  background-color: #393939;
+  background-color: $xfce_panel_bg;
   color: $panel_fg;
 
   button {
@@ -857,11 +857,11 @@ MatePanelAppletFrameDBus > MatePanelAppletFrameDBus {
   color: $panel_fg;
   border-radius: 0;
   border: none;
-  background-color: transparentize($panel_bg, 1);
+  background-color: transparentize($xfce_panel_bg, 1);
 
   &:hover {
     border: none;
-    background-color: lighten($panel_bg, 10%);
+    background-color: lighten($xfce_panel_bg, 10%);
   }
 
   &:active, &:checked {

gtk/upstream/gtk-3.0/Mint-Y/sass/_colors.scss

@@ -58,7 +58,7 @@ $wm_icon_hover_bg:      null;
 } @else {
     // Dark Variant Colors
     $opposite:              WHITE;
-    $base_color:            #2E2E33;
+    $base_color:            #333339;
     $text_color:            #DADADA;
     $header_bg:             #222226;
     $bg_color:              lighten($header_bg, 5%);
@@ -127,6 +127,12 @@ $tooltip_bg_color: transparentize(mix($selected_bg_color, black, 95%), 0.05);
 $tooltip_fg_color: #FFFFFF;
 $drop_target_color: $selected_bg_color;
 
+@if $variant == 'light' {
+    $button_active_bg: transparentize(black, 0.85);
+} @else {
+    $button_active_bg: transparentize(white, 0.85);
+}
+
 // Links and status
 $link_color: #5294E2;
 $link_visited_color: #5294E2;
@@ -140,8 +146,9 @@ $suggested_color: #6DB442;
 $question_color: #55C1EC;
 
 // Panel (MATE/Xfce)
-$panel_bg: #2F2F2F;
-$panel_fg: #DADADA;
+$xfce_panel_bg: #2e2e33;
+$panel_bg: #222226;
+$panel_fg: #e1e1e1;
 
 // Apps
 $terminal_bg: #222226;

gtk/upstream/gtk-3.0/Mint-Y/sass/_common.scss

@@ -2623,6 +2623,18 @@ filechooserbutton:drop(active) {
   border-color: transparent;
 }
 
+//
+// PrintDialog
+//
+printdialog {
+  paper {
+    background-color: white;
+    color: $fg_color;
+    border: 1px solid $borders_color;
+    padding: 0;
+  }
+}
+
 //
 // Sidebar
 //

gtk/upstream/gtk-3.0/Mint-Y/sass/_ubiquity.scss

@@ -3,6 +3,6 @@
 //
 
 .ubiquity-menubar {
-  background-color: #3f3f3f;
+  background-color: #3f3f43;
   color: #eeeeee;
 }