Move source editor out of module (#12457)

* Update Copybara options in preparation for open-sourcing the source editor

* Move files

* Update paths

* Remove source-editor module and checks for its existence

* Explicitly mention CM6 license in files that contain code adapted from CM6

GitOrigin-RevId: 89b7cc2b409db01ad103198ccbd1b126ab56349b

services/web/frontend/js/features/source-editor/utils/effects.ts

@@ -0,0 +1,19 @@
+import { StateEffectType, Transaction } from '@codemirror/state'
+import { ViewUpdate } from '@codemirror/view'
+
+export const hasEffect =
+  <T>(effectType: StateEffectType<T>) =>
+  (tr: Transaction) =>
+    tr.effects.some(effect => effect.is(effectType))
+
+export const updateHasEffect =
+  <T>(effectType: StateEffectType<T>) =>
+  (update: ViewUpdate) =>
+    update.transactions.some(tr =>
+      tr.effects.some(effect => effect.is(effectType))
+    )
+
+export const findEffect =
+  <T>(effectType: StateEffectType<T>) =>
+  (tr: Transaction) =>
+    tr.effects.find(effect => effect.is(effectType))