Quote: Prevent block theme styles overriding global border and padding (

#64045)

Co-authored-by: aaronrobertshaw <aaronrobertshaw@git.wordpress.org>
Co-authored-by: t-hamano <wildworks@git.wordpress.org>
Co-authored-by: ramonjd <ramonopoly@git.wordpress.org>

packages/block-library/src/quote/theme.scss

@@ -10,19 +10,21 @@
 		font-style: normal;
 	}
 
-	&.has-text-align-right {
+	&:where(.has-text-align-right) {
 		border-left: none;
 		border-right: 0.25em solid currentColor;
 		padding-left: 0;
 		padding-right: 1em;
 	}
 
-	&.has-text-align-center {
+	&:where(.has-text-align-center) {
 		border: none;
 		padding-left: 0;
 	}
 	// .is-style-large and .is-large are kept for backwards compatibility.
-	&.is-style-plain,
+	// They are not wrapped in `:where()` to keep specificity as it was before
+	// they were deprecated.
+	&:where(.is-style-plain),
 	&.is-style-large,
 	&.is-large {
 		border: none;