Fix scrolling issue for iOS / iPad OS

Window height in iPad is actually less than 100vh because of the
presence of a bottom bar in the browser. Adding position: fixed
and max-height: 100% fixes this.

app/assets/stylesheets/page_bundles/ide.scss

@@ -25,6 +25,13 @@ $ide-commit-header-height: 48px;
   @include str-truncated(250px);
 }
 
+.ide-layout {
+  // Fix for iOS 13+, the height of the page is actually less than
+  // 100vh because of the presence of the bottom bar
+  max-height: 100%;
+  position: fixed;
+}
+
 .ide-view {
   position: relative;
   margin-top: 0;

changelogs/unreleased/213587-ide-ipad-scroll-issue.yml

+---
+title: Fix issues with scroll on iOS / iPad OS
+merge_request: 34486
+author:
+type: fixed