Layout: Improved sidebar sizing, and dropdown consideration

- Updated tri-layout sidebars to have less padding and to avoid cutting
  off content when in single-sidebar mode.
- Updated dropdown handling to consider the parent scroll container when
  deciding to drop upwards, to help prevent cut-off.

resources/js/components/dropdown.js

@@ -1,4 +1,4 @@
-import {onSelect} from '../services/dom.ts';
+import {findClosestScrollContainer, onSelect} from '../services/dom.ts';
 import {KeyboardNavigationHandler} from '../services/keyboard-navigation.ts';
 import {Component} from './component';
 
@@ -33,7 +33,8 @@ export class Dropdown extends Component {
         const menuOriginalRect = this.menu.getBoundingClientRect();
         let heightOffset = 0;
         const toggleHeight = this.toggle.getBoundingClientRect().height;
-        const dropUpwards = menuOriginalRect.bottom > window.innerHeight;
+        const containerBounds = findClosestScrollContainer(this.menu).getBoundingClientRect();
+        const dropUpwards = menuOriginalRect.bottom > containerBounds.bottom;
         const containerRect = this.container.getBoundingClientRect();
 
         // If enabled, Move to body to prevent being trapped within scrollable sections

resources/js/services/dom.ts

@@ -256,4 +256,22 @@ export function findTargetNodeAndOffset(parentNode: HTMLElement, offset: number)
 export function hashElement(element: HTMLElement): string {
     const normalisedElemText = (element.textContent || '').replace(/\s{2,}/g, '');
     return cyrb53(normalisedElemText);
+}
+
+/**
+ * Find the closest scroll container parent for the given element
+ * otherwise will default to the body element.
+ */
+export function findClosestScrollContainer(start: HTMLElement): HTMLElement {
+    let el: HTMLElement|null = start;
+    do {
+        const computed = window.getComputedStyle(el);
+        if (computed.overflowY === 'scroll') {
+            return el;
+        }
+
+        el = el.parentElement;
+    } while (el);
+
+    return document.body;
 }