[IMP] mail, im_livechat: manage downgrade of local storage

This commit adds versioning to local storage entries, so that when
version is more recent than current version, business code can have
a strategy to drop the values.

This strategy is the one used by local storage field: older versions
are most updated and upgraded fields so 19.1 is implicitly valid for
19.2 and 19.3. 20.0 is invalid as it can potentially be affected
by unknown upgrade scripts of current version (19.3), thus it's
dropped.

Part of Task-5003012

Author: alexkuhn

addons/mail/static/src/model/model_internal.js

@@ -1,5 +1,7 @@
 import { toRaw } from "@odoo/owl";
 import { ATTR_SYM, MANY_SYM, ONE_SYM } from "./misc";
+import { parseVersion } from "@mail/utils/common/misc";
+import { getCurrentLocalStorageVersion } from "@mail/utils/common/local_storage";
 
 export class ModelInternal {
     /** @type {Map<string, boolean>} */
@@ -76,7 +78,8 @@ export class ModelInternal {
                     const record = toRaw(this)._raw;
                     const lse = record._.fieldsLocalStorage.get(fieldName);
                     const parsed = lse.parse();
-                    if (!parsed) {
+                    const currentOdooVersion = getCurrentLocalStorageVersion();
+                    if (!parsed || parseVersion(currentOdooVersion).isLowerThan(parsed.version)) {
                         lse.remove();
                         return this[fieldName];
                     }

addons/mail/static/src/model/store_internal.js

@@ -6,7 +6,7 @@ import { RecordInternal } from "./record_internal";
 import { deserializeDate, deserializeDateTime } from "@web/core/l10n/dates";
 import { IS_DELETED_SYM, isCommand, isMany } from "./misc";
 import { browser } from "@web/core/browser/browser";
-import { parseRawValue } from "@mail/utils/common/local_storage";
+import { getCurrentLocalStorageVersion, parseRawValue } from "@mail/utils/common/local_storage";
 
 const Markup = markup().constructor;
 
@@ -55,7 +55,7 @@ export class StoreInternal extends RecordInternal {
                 record._proxy[fieldName] = record._.fieldsDefault.get(fieldName);
             } else {
                 const parsed = parseRawValue(ev.newValue);
-                if (!parsed) {
+                if (!parsed || parsed.version !== getCurrentLocalStorageVersion()) {
                     record._proxy[fieldName] = record._.fieldsDefault.get(fieldName);
                 } else {
                     record._proxy[fieldName] = parsed.value;

addons/mail/static/src/utils/common/local_storage.js

@@ -31,12 +31,12 @@ export class LocalStorageEntry {
     parse() {
         return parseRawValue(this.get());
     }
-    set(value) {
+    set(value, version = getCurrentLocalStorageVersion()) {
         const parsed = this.parse();
-        if (parsed && parsed.value === value) {
+        if (parsed && parsed.value === value && parsed.version === version) {
             return;
         }
-        browser.localStorage.setItem(this.key, toRawValue(value));
+        browser.localStorage.setItem(this.key, toRawValue(value, version));
     }
     remove() {
         if (this.get() === null) {
@@ -46,8 +46,8 @@ export class LocalStorageEntry {
     }
 }
 
-export function toRawValue(value) {
-    return JSON.stringify({ value });
+export function toRawValue(value, version = getCurrentLocalStorageVersion()) {
+    return JSON.stringify({ value, version });
 }
 
 /**