Fixed
- Recently closed tabs (sub-panel): close it right after dnd start
- Tab preview: vertical positioning (in-page popup)
- Tabs: parentId is not specified when auto-reopening tab on request (resolves #2009)
- SetupPage/navbar: removing non-panel element with "x" button (resolves #2018)
- Panel config: custom icon: file (resolves #2015)
Localization
- Grammar in cookie clearing message (by @Sushisource: #2006)
- Corrections in Polish (by @MStankiewiczOfficial: #2017)