Gtk-4: Fix theme parsing erros and warnings

gtk-4.0/_common.scss

@@ -13,24 +13,6 @@ $button_transition: all 200ms $ease-out-quad;
 
 * {
   padding: 0;
-  -GtkToolButton-icon-spacing: 4;
-  -GtkTextView-error-underline-color: $error_color;
-
-  // The size for scrollbars. The slider is 2px smaller, but we keep it
-  // up so that the whole area is sensitive to button presses for the
-  // slider. The stepper button is larger in both directions, the slider
-  // only in the width
-
-  -GtkScrolledWindow-scrollbar-spacing: 0;
-
-  -GtkToolItemGroup-expander-size: 11;
-
-  -GtkWidget-text-handle-width: 20;
-  -GtkWidget-text-handle-height: 24;
-
-  -GtkDialog-button-spacing: 4;
-  -GtkDialog-action-area-border: 0;
-
   // We use the outline properties to signal the focus properties
   // to the adwaita engine: using real CSS properties is faster,
   // and we don't use any outlines for now.
@@ -39,7 +21,6 @@ $button_transition: all 200ms $ease-out-quad;
   outline-style: dashed;
   outline-offset: -3px;
   outline-width: 0px;
-  -gtk-outline-radius: 2px;
 
   -gtk-secondary-caret-color: $selected_bg_color;
 }