[MainUI] Wrong calculation of not shown add-ons

[dilyanpalauzov]

From https://community.openhab.org/t/java223-scripting-script-with-java-on-openhab-5-0-1-0-6-0-0-0 I download the https://github.com/dalgwen/openhab-addons/releases/download/5.0.1-java223-BETA4/org.openhab.automation.java223-5.0.1.jar file under /usr/share/openhab/addons in openHAB 5.1.0 Build 4911.

Then I visit GET /addons/automation/ which shows 16 automation addons and a button “Show 4 more”.

I click on that button, the button disappears and again 16 automation addons are displayed.

Few minutes before I started writing I think the text was “show 3 more”, but now it is consistently “show 4 more” when I reload the page.

• The amount of not shown addons, which can be displayed by the button “Show [number] more” is not calculated correctly.