revert: don't force multiline flag for editor component patterns (#3089)

* revert: don't force multiline flag for editor component patterns

refs: 338c1b68d2865a20fed851295451175b840983d4, 4839160ee6126adfbab7bfa58452560090c00737

github issues: 3088, 3086

* fix: only trim ending white spaces/line breaks when parsing shortcodes

remark validates the value of the 'eat' function using a prefix match between the original value and the value provided. Trimming the start can break that validation

* fix: change console log to warn

packages/netlify-cms-core/src/valueObjects/EditorComponent.js

@@ -26,7 +26,7 @@ export default function createEditorComponent(config) {
     icon,
     widget,
     // enforce multiline flag, exclude others
-    pattern: new RegExp(pattern, 'm'),
+    pattern,
     fromBlock: bind(fromBlock) || (() => ({})),
     toBlock: bind(toBlock) || (() => 'Plugin'),
     toPreview: bind(toPreview) || (!widget && (bind(toBlock) || (() => 'Plugin'))),

packages/netlify-cms-widget-markdown/src/serializers/remarkShortcodes.js

@@ -11,8 +11,14 @@ export function remarkParseShortcodes({ plugins }) {
 function createShortcodeTokenizer({ plugins }) {
   return function tokenizeShortcode(eat, value, silent) {
     let match;
+    const potentialMatchValue = value.split('\n\n')[0].trimEnd();
     const plugin = plugins.find(plugin => {
       match = value.match(plugin.pattern);
+
+      if (!match) {
+        match = potentialMatchValue.match(plugin.pattern);
+      }
+
       return !!match;
     });
 
@@ -23,10 +29,19 @@ function createShortcodeTokenizer({ plugins }) {
 
       const shortcodeData = plugin.fromBlock(match);
 
-      return eat(match[0])({
-        type: 'shortcode',
-        data: { shortcode: plugin.id, shortcodeData },
-      });
+      try {
+        return eat(match[0])({
+          type: 'shortcode',
+          data: { shortcode: plugin.id, shortcodeData },
+        });
+      } catch (e) {
+        console.warn(
+          `Sent invalid data to remark. Plugin: ${plugin.id}. Value: ${
+            match[0]
+          }. Data: ${JSON.stringify(shortcodeData)}`,
+        );
+        return false;
+      }
     }
   };
 }