A handful of issues were missed in Twenty Ten's Gutenberg support, added in #45038. This commit includes the following fixes:
* Update editor placeholder text to use the correct font family and size.
* Remove unnecessary spacing from the Columns block.
* Include non "image" variations of the Cover block classes `.wp-block-cover` and `.wp-block-cover-text` in the styles.
* Add spacing underneath the Media & Text block.
* Simplify selectors used to set editor width to just `.wp-block`.
Fixes#45238.
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This update adds styles and theme support related to the new block-based editor to enhance the experience of using it with Twenty Ten.
These are the specific changes made to this theme:
* Add blocks.css, to style blocks on the front end, to make sure they match the theme’s existing HTML element styles.
* Add editor-blocks.css to style blocks in the editor, to make sure they match the theme’s existing HTML element styles.
* Add theme support for `editor-styles`, to pull the existing editor stylesheet into the new editor.
* Add theme support for `wp-block-styles`, to load the default block styles on the front end.
* Add theme support for `editor-color-palette`, to load a color palette based on the theme’s color scheme into the block-based editor.
Props nielslange, crunnells, laurelfulford.
Fixes#45038.
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laurelfulford
David A. Kennedy