Fixed KeepAlive issue where too large of a session value would fire the keep alive immediately (fixes #1860)

CHANGELOG.md

@@ -21,6 +21,7 @@
     * Fixed folder auto-naming in Add Module [#1937](https://github.com/getgrav/grav-plugin-admin/issues/1937) 
     * Fixed remodal issue triggering close when selecting a dropdown item ending outside of scope [#1682](https://github.com/getgrav/grav-plugin-admin/issues/1682)
     * Reworked how collapsed lists work so the tooltip is not cut off [#1928](https://github.com/getgrav/grav-plugin-admin/issues/1928) 
+    * Fixed KeepAlive issue where too large of a session value would fire the keep alive immediately [#1860](https://github.com/getgrav/grav-plugin-admin/issues/1860)
 
 # v1.10.0-rc.17
 ## 10/07/2020

themes/grav/app/utils/keepalive.js

@@ -1,6 +1,8 @@
 import { config } from 'grav-config';
 import { userFeedbackError } from './response';
 
+const MAX_SAFE_DELAY = 2147483647;
+
 class KeepAlive {
     constructor() {
         this.active = false;
@@ -8,7 +10,7 @@ class KeepAlive {
 
     start() {
         let timeout = config.admin_timeout / 1.5 * 1000;
-        this.timer = setInterval(() => this.fetch(), timeout);
+        this.timer = setInterval(() => this.fetch(), Math.min(timeout, MAX_SAFE_DELAY));
         this.active = true;
     }