From e106618c392d7a18a148179ec5d0371bdea894ad Mon Sep 17 00:00:00 2001
From: shamoon <4887959+shamoon@users.noreply.github.com>
Date: Wed, 22 Jul 2026 08:42:31 -0700
Subject: [PATCH] Fix (beta): dont include hidden buttons in virtual scroll
 container height (#13194)

---
 .../filterable-dropdown.component.html        | 28 +++++++++----------
 .../filterable-dropdown.component.spec.ts     | 27 +++++++++++++++++-
 .../filterable-dropdown.component.ts          | 17 +++++++----
 3 files changed, 50 insertions(+), 22 deletions(-)

diff --git a/src-ui/src/app/components/common/filterable-dropdown/filterable-dropdown.component.html b/src-ui/src/app/components/common/filterable-dropdown/filterable-dropdown.component.html
index 0c73227bc..f03895662 100644
--- a/src-ui/src/app/components/common/filterable-dropdown/filterable-dropdown.component.html
+++ b/src-ui/src/app/components/common/filterable-dropdown/filterable-dropdown.component.html
@@ -34,30 +34,28 @@
       </div>
       @if (selectionModel.items) {
         <cdk-virtual-scroll-viewport class="items" [itemSize]="FILTERABLE_BUTTON_HEIGHT_PX" #buttonsViewport [style.height.px]="scrollViewportHeight">
-          <div *cdkVirtualFor="let item of selectionModel.items | filter: filterText:'name'; trackBy: trackByItem; let i = index">
-            @if (allowSelectNone || item.id) {
-              <pngx-toggleable-dropdown-button
-                [item]="item"
-                [hideCount]="hideCount(item)"
-                [opacifyCount]="!editing"
-                [state]="selectionModel.get(item.id)"
-                [count]="getUpdatedDocumentCount(item.id)"
-                (toggled)="selectionModel.toggle(item.id)"
-                (exclude)="excludeClicked(item.id)"
-                [disabled]="disabled">
-              </pngx-toggleable-dropdown-button>
-            }
+          <div *cdkVirtualFor="let item of filteredItems; trackBy: trackByItem; let i = index">
+            <pngx-toggleable-dropdown-button
+              [item]="item"
+              [hideCount]="hideCount(item)"
+              [opacifyCount]="!editing"
+              [state]="selectionModel.get(item.id)"
+              [count]="getUpdatedDocumentCount(item.id)"
+              (toggled)="selectionModel.toggle(item.id)"
+              (exclude)="excludeClicked(item.id)"
+              [disabled]="disabled">
+            </pngx-toggleable-dropdown-button>
           </div>
         </cdk-virtual-scroll-viewport>
       }
       @if (editing) {
-        @if ((selectionModel.items | filter: filterText:'name').length === 0 && createRef !== undefined) {
+        @if (filteredItems.length === 0 && createRef !== undefined) {
           <button class="list-group-item list-group-item-action bg-light" (click)="createClicked()" [disabled]="disabled">
             <small class="ms-2"><ng-container i18n>Create</ng-container> "{{filterText}}"</small>
             <i-bs width="1.5em" height="1em" name="plus"></i-bs>
           </button>
         }
-        @if ((selectionModel.items | filter: filterText:'name').length > 0) {
+        @if (filteredItems.length > 0) {
           <button class="list-group-item list-group-item-action bg-light d-flex align-items-center" (click)="applyClicked()" [disabled]="!modelIsDirty() || disabled">
             <small class="ms-2" [ngClass]="{'fw-bold': modelIsDirty()}" i18n>Apply</small>
             <i-bs width="1.5em" height="1em" name="arrow-right"></i-bs>
diff --git a/src-ui/src/app/components/common/filterable-dropdown/filterable-dropdown.component.spec.ts b/src-ui/src/app/components/common/filterable-dropdown/filterable-dropdown.component.spec.ts
index 8cb094e31..b3ba7b8e7 100644
--- a/src-ui/src/app/components/common/filterable-dropdown/filterable-dropdown.component.spec.ts
+++ b/src-ui/src/app/components/common/filterable-dropdown/filterable-dropdown.component.spec.ts
@@ -265,7 +265,9 @@ describe('FilterableDropdownComponent & FilterableDropdownSelectionModel', () =>
     expect(document.activeElement).toEqual(
       component.listFilterTextInput.nativeElement
     )
-    expect(component.buttonsViewport.getRenderedRange().end).toEqual(3) // all items shown
+    expect(component.buttonsViewport.getRenderedRange().end).toEqual(
+      items.length
+    ) // all selectable items shown
 
     component.filterText = 'Tag2'
     fixture.detectChanges()
@@ -278,6 +280,29 @@ describe('FilterableDropdownComponent & FilterableDropdownSelectionModel', () =>
     expect(component.filterText).toHaveLength(0)
   })
 
+  it('should omit disallowed null items from the virtual scroll viewport', async () => {
+    component.selectionModel.items = items
+    component.icon = 'tag-fill'
+    fixture.nativeElement
+      .querySelector('button')
+      .dispatchEvent(new MouseEvent('click')) // open
+    fixture.detectChanges()
+    await wait(100)
+    fixture.detectChanges()
+    component.buttonsViewport?.checkViewportSize()
+    fixture.detectChanges()
+
+    expect(component.filteredItems).toEqual(items)
+    expect(component.scrollViewportHeight).toEqual(
+      items.length * component.FILTERABLE_BUTTON_HEIGHT_PX
+    )
+    expect(
+      component.buttonsViewport.elementRef.nativeElement.querySelectorAll(
+        '.cdk-virtual-scroll-content-wrapper > div'
+      )
+    ).toHaveLength(items.length)
+  })
+
   it('should toggle & close on enter inside filter field if 1 item remains', async () => {
     component.selectionModel.items = items
     component.icon = 'tag-fill'
diff --git a/src-ui/src/app/components/common/filterable-dropdown/filterable-dropdown.component.ts b/src-ui/src/app/components/common/filterable-dropdown/filterable-dropdown.component.ts
index 1951a73bf..d78711c2c 100644
--- a/src-ui/src/app/components/common/filterable-dropdown/filterable-dropdown.component.ts
+++ b/src-ui/src/app/components/common/filterable-dropdown/filterable-dropdown.component.ts
@@ -801,12 +801,17 @@ export class FilterableDropdownComponent
 
   private keyboardIndex: number
 
+  public get filteredItems(): MatchingModel[] {
+    return this.filterPipe
+      .transform(this.items, this.filterText, 'name')
+      .filter((item) => this.allowSelectNone || Boolean(item.id))
+  }
+
   public get scrollViewportHeight(): number {
-    const filteredLength = this.filterPipe.transform(
-      this.items,
-      this.filterText
-    ).length
-    return Math.min(filteredLength * this.FILTERABLE_BUTTON_HEIGHT_PX, 400)
+    return Math.min(
+      this.filteredItems.length * this.FILTERABLE_BUTTON_HEIGHT_PX,
+      400
+    )
   }
 
   constructor() {
@@ -878,7 +883,7 @@ export class FilterableDropdownComponent
   }
 
   listFilterEnter(): void {
-    let filtered = this.filterPipe.transform(this.items, this.filterText)
+    const filtered = this.filteredItems
     if (filtered.length == 1) {
       this.selectionModel.toggle(filtered[0].id)
       setTimeout(() => {