fix: FLUX-595 - vl-datepicker - positionering calendar aangepast voor scroll correctie#729
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…API + CSS Anchor Positioning Vervangt de manuele getBoundingClientRect + scrollY/X berekening door native, evergreen browser API (Popover API & anchor()) voor robuustere kalender-positionering. Probleem: De oude positionering werkte niet bij scrollbare parent containers, overflow-clipping door ancestor-elementen, en transform-ancestors (zoals vl-modal met transform: translate(-50%, -50%)). Oplossing: - Popover API (popover="manual") voor top-layer rendering - CSS Anchor Positioning (anchor-name, position-anchor, anchor()) voor browser-native positionering - @position-try fallbacks voor smalle viewports en boven/onder flipping - position attribuut mapping (auto, above, below, etc.) via CSS
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https://jira.omgeving.vlaanderen.be/jira/browse/FLUX-595
https://www.milieuinfo.be/bamboo/browse/FLUX-CFWC274 ✅
getBoundingClientRect() geeft coördinaten terug relatief ten opzichte van de viewport. Wanneer de pagina gescrolled is, blijven deze waarden relatief ten opzichte van de huidige viewport positie, zonder rekening te houden met de scroll offset.
De calendar placeholder werd dus verkeerd gepositioneerd wanneer de gebruiker gescrolled had, omdat de top/left waarden niet gecorrigeerd werden voor de scroll positie.
De fix voegt window.scrollY en window.scrollX toe aan de berekening, zodat de absolute positie correct berekend wordt ongeacht de scroll positie van de pagina.