LibWeb: Fix document element's .scrollHeight and .scrollWidth

We were using the viewport's size as the viewport scrolling area, but those are completely different things.
Author: https://github.com/gmta Commit: e8e6dbcee0 Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/5121 Reviewed-by: https://github.com/tcl3 ✅
2025-09-29 04:39:10 +00:00 · 2025-06-17 16:55:24 +02:00 · 2025-06-17 16:55:24 +02:00 · e8e6dbcee0 · 2025-06-17 16:18:46 +00:00
commit e8e6dbcee0
parent 8f139d065c
8 changed files with 36 additions and 16 deletions
--- a/Tests/LibWeb/Text/expected/DOM/Element-documentElement-scrollWidthHeight.txt
+++ b/Tests/LibWeb/Text/expected/DOM/Element-documentElement-scrollWidthHeight.txt
@ -0,0 +1,2 @@
+document.documentElement.scrollWidth: 1242
+document.documentElement.scrollHeight: 1481
--- a/Tests/LibWeb/Text/expected/DOM/element-scroll-height.txt
+++ b/Tests/LibWeb/Text/expected/DOM/element-scroll-height.txt
--- a/Tests/LibWeb/Text/expected/DOM/element-scroll-width.txt
+++ b/Tests/LibWeb/Text/expected/DOM/element-scroll-width.txt