Fix gallery media uploader across blocks (#1730)

* use new styles

* use new styles

* Minor tweak

Co-authored-by: Rich Tabor <hi@richtabor.com>

src/components/block-gallery/styles/editor.scss

@@ -17,3 +17,25 @@
 [data-type*="coblocks/gallery"] .is-appender {
 	outline-offset: -1px;
 }
+
+// Apply gallery placeholder styles to gallery blocks.
+[data-type*="coblocks/gallery"] {
+
+	.coblocks-gallery,
+	.coblocks-gallery--item,
+	.components-resizable-box__container {
+
+		~ div .coblocks-gallery--figure.is-appender .components-placeholder__label {
+			display: none; // Gallery has images - hide label div
+		}
+	}
+
+	.coblocks-gallery--figure.is-appender {
+		margin-bottom: 12px;
+		padding: 12px;
+
+		.components-placeholder__fieldset .block-editor-media-placeholder__upload-button {
+			margin-bottom: 0 !important;
+		}
+	}
+}