use the new originalDigest in update UI

...when force-updating a locally edited style that turned out to be equal to the remote one

fixes #482

background/update.js

@@ -153,9 +153,8 @@ global API_METHODS
           case 0:
             // re-install is invalid in a soft upgrade
             if (!ignoreDigest) {
-              return Promise.reject(STATES.SAME_VERSION);
+              const sameCode = text === style.sourceCode;
-            } else if (text === style.sourceCode) {
+              return Promise.reject(sameCode ? STATES.SAME_CODE : STATES.SAME_VERSION);
-              return Promise.reject(STATES.SAME_CODE);
             }
             break;
           case 1:
@@ -188,8 +187,12 @@ global API_METHODS
 
       if (styleSectionsEqual(json, style)) {
         // update digest even if save === false as there might be just a space added etc.
-        saveStyle(Object.assign(json, {reason: 'update-digest'}));
+        json.reason = 'update-digest';
-        return Promise.reject(STATES.SAME_CODE);
+        return saveStyle(json)
+          .then(saved => {
+            style.originalDigest = saved.originalDigest;
+            return Promise.reject(STATES.SAME_CODE);
+          });
       }
 
       if (!style.originalDigest && !ignoreDigest) {

js/sections-equal.js

@@ -1,7 +1,24 @@
 'use strict';
 
-// ignoreCode=true is used by invalidateCache to determine if cached filters should be cleared
+/**
-function styleSectionsEqual({sections: a}, {sections: b}, {ignoreCode = false} = {}) {
+ * @param {Style} a - first style object
+ * @param {Style} b - second style object
+ * @param {Object} options
+ * @param {Boolean=} options.ignoreCode -
+ *        true used by invalidateCache to determine if cached filters should be cleared
+ * @param {Boolean=} options.checkSource -
+ *        true used by update check to compare the server response
+ *        instead of sections that depend on @preprocessor
+ * @returns {Boolean|undefined}
+ */
+function styleSectionsEqual(a, b, {ignoreCode, checkSource} = {}) {
+  if (!checkSource &&
+      typeof a.sourceCode === 'string' &&
+      typeof b.sourceCode === 'string') {
+    return a.sourceCode === b.sourceCode;
+  }
+  a = a.sections;
+  b = b.sections;
   if (!a || !b) {
     return undefined;
   }

manage/updater-ui.js

@@ -155,6 +155,16 @@ function reportUpdateState({updated, style, error, STATES}) {
     $('.update-note', entry).textContent = message;
     $('.check-update', entry).title = newUI.enabled ? message : '';
     $('.update', entry).title = t(edited ? 'updateCheckManualUpdateForce' : 'installUpdate');
+    // digest may change silently when forcing an update of a locally edited style
+    // so we need to update it in entry's styleMeta in all open manager tabs
+    if (error === STATES.SAME_CODE) {
+      for (const view of chrome.extension.getViews({type: 'tab'})) {
+        if (view.location.pathname === location.pathname) {
+          const entry = view.$(ENTRY_ID_PREFIX + style.id);
+          if (entry) entry.styleMeta.originalDigest = style.originalDigest;
+        }
+      }
+    }
     if (!isCheckAll) {
       renderUpdatesOnlyFilter({show: $('.can-update, .update-problem')});
     }