Warnings with GTK 4

[mikedld]

Using 25f312f, when starting a GTK 4 (4.8.0) app a number of warnings is printed:

Theme parser error: gtk.css:123:137-163: Expected a valid color.
Theme parser error: gtk.css:129:143-169: Expected a valid color.
Theme parser error: gtk.css:155:615-641: Expected a valid color.
Theme parser error: gtk.css:157:663-689: Expected a valid color.
Theme parser error: gtk.css:167:356-382: Expected a valid color.
Theme parser error: gtk.css:169:380-406: Expected a valid color.
Theme parser error: gtk.css:173:702-728: Expected a valid color.
Theme parser error: gtk.css:175:750-776: Expected a valid color.
Theme parser error: gtk.css:189:55-69: Not a valid image
Theme parser error: gtk.css:190:26-40: Not a valid image
Theme parser error: gtk.css:200:357-373: No property named "-gtk-icon-effect"
Theme parser error: gtk.css:204:589-605: No property named "-gtk-icon-effect"
Theme parser error: gtk.css:390:42-61: No property named "-gtk-outline-radius"
Theme parser error: gtk.css:430:814-833: No property named "-gtk-outline-radius"
Theme parser error: gtk.css:432:1242-1270: No property named "-gtk-outline-top-left-radius"
Theme parser error: gtk.css:432:1277-1308: No property named "-gtk-outline-bottom-left-radius"
Theme parser error: gtk.css:434:1237-1266: No property named "-gtk-outline-top-right-radius"
Theme parser error: gtk.css:434:1273-1305: No property named "-gtk-outline-bottom-right-radius"
Theme parser error: gtk.css:436:1410-1429: No property named "-gtk-outline-radius"
Theme parser error: gtk.css:438:391-410: No property named "-gtk-outline-radius"
Theme parser error: gtk.css:440:1014-1042: No property named "-gtk-outline-top-left-radius"
Theme parser error: gtk.css:440:1049-1078: No property named "-gtk-outline-top-right-radius"
Theme parser error: gtk.css:442:1044-1075: No property named "-gtk-outline-bottom-left-radius"
Theme parser error: gtk.css:442:1082-1114: No property named "-gtk-outline-bottom-right-radius"
Theme parser error: gtk.css:444:464-483: No property named "-gtk-outline-radius"
Theme parser error: gtk.css:577:54-80: No property named "-GtkWidget-window-dragging"
Theme parser error: gtk.css:637:610-626: No property named "-gtk-icon-effect"
Theme parser error: gtk.css:757:102-135: No property named "-GtkTreeView-horizontal-separator"
Theme parser error: gtk.css:757:140-168: No property named "-GtkTreeView-grid-line-width"
Theme parser error: gtk.css:757:173-203: No property named "-GtkTreeView-grid-line-pattern"
Theme parser error: gtk.css:757:209-237: No property named "-GtkTreeView-tree-line-width"
Theme parser error: gtk.css:757:242-272: No property named "-GtkTreeView-tree-line-pattern"
Theme parser error: gtk.css:757:278-304: No property named "-GtkTreeView-expander-size"
Theme parser error: gtk.css:834:21-47: No property named "-GtkWidget-window-dragging"
Theme parser error: gtk.css:1047:102-136: No property named "-GtkScrollbar-has-backward-stepper"
Theme parser error: gtk.css:1047:145-178: No property named "-GtkScrollbar-has-forward-stepper"
Theme parser error: gtk.css:1311:95-114: No property named "-gtk-outline-radius"
Theme parser error: gtk.css:1313:51-70: No property named "-gtk-outline-radius"
Theme parser error: gtk.css:1513:50-64: Not a valid image
Theme parser error: gtk.css:1515:59-73: Not a valid image
Theme parser error: gtk.css:1517:53-67: Not a valid image
Theme parser error: gtk.css:1519:62-76: Not a valid image
Theme parser error: gtk.css:1521:51-65: Not a valid image
Theme parser error: gtk.css:1523:60-74: Not a valid image
Theme parser error: gtk.css:1525:52-66: Not a valid image
Theme parser error: gtk.css:1527:61-75: Not a valid image
Theme parser error: gtk.css:1628:715-746: No property named "-gtk-outline-bottom-left-radius"
Theme parser error: gtk.css:1630:688-720: No property named "-gtk-outline-bottom-right-radius"
Theme parser error: gtk.css:1702:130-149: No property named "-gtk-outline-radius"
Theme parser error: gtk.css:1860:23-39: No property named "-gtk-icon-effect"
Theme parser error: gtk.css:1930:42-61: No property named "-gtk-outline-radius"