Query Title: Add padding support (#43458)

* Adding padding support to the Query Title block.

* Added box-sizing styles and removed unused editor stylesheet declaration.

docs/reference-guides/core-blocks.md

@@ -662,7 +662,7 @@ Display the query title. ([Source](https://github.com/WordPress/gutenberg/tree/t
 
 -	**Name:** core/query-title
 -	**Category:** theme
--	**Supports:** align (full, wide), color (background, gradients, text), spacing (margin), typography (fontSize, lineHeight), ~~html~~
+-	**Supports:** align (full, wide), color (background, gradients, text), spacing (margin, padding), typography (fontSize, lineHeight), ~~html~~
 -	**Attributes:** level, showPrefix, showSearchTerm, textAlign, type
 
 ## Quote

packages/block-library/src/query-title/block.json

@@ -37,7 +37,8 @@
 			}
 		},
 		"spacing": {
-			"margin": true
+			"margin": true,
+			"padding": true
 		},
 		"typography": {
 			"fontSize": true,
@@ -54,5 +55,5 @@
 			}
 		}
 	},
-	"editorStyle": "wp-block-query-title-editor"
+	"style": "wp-block-query-title"
 }

packages/block-library/src/query-title/style.scss

@@ -0,0 +1,4 @@
+.wp-block-query-title {
+	// This block has customizable padding, border-box makes that more predictable.
+	box-sizing: border-box;
+}

packages/block-library/src/style.scss

@@ -36,6 +36,7 @@
 @import "./pullquote/style.scss";
 @import "./post-template/style.scss";
 @import "./query-pagination/style.scss";
+@import "./query-title/style.scss";
 @import "./quote/style.scss";
 @import "./read-more/style.scss";
 @import "./rss/style.scss";