Allow spaces after tabs for alignment

This is needed for proper alignment of comments in CSS code embedded in
Vue files. For example:
-->/* Here starts a long comment that would be too long to have in a
--> * single line so is continued in the next one. */

See https://eslint.org/docs/rules/no-mixed-spaces-and-tabs#smart-tabs

Signed-off-by: Daniel Calviño Sánchez <[email protected]>

index.js

@@ -37,6 +37,8 @@ module.exports = {
 		indent: ['error', 'tab'],
 		'no-tabs': ['error', { allowIndentationTabs: true }],
 		'vue/html-indent': ['error', 'tab'],
+		// allow spaces after tabs for alignment
+		'no-mixed-spaces-and-tabs': ['error', 'smart-tabs'],
 		// only debug console
 		'no-console': ['error', { allow: ['error', 'warn', 'info', 'debug'] }],
 		// classes blocks