Release 2.20.6: saved-image slide previews

src/web/public/css/theme-custom.css

@@ -2477,9 +2477,8 @@ td[data-label="Slides"] {
   padding: 0.875rem;
 }
 
-.slide-editor-shell .slide-preview-scroll {
-  max-height: calc(100vh - 8rem);
-  overflow: auto;
+.slide-editor-shell .slide-preview-stage {
+  max-height: max(12rem, calc(100vh - 22rem));
 }
 
 .slide-preview-header h3 {
@@ -4658,10 +4657,15 @@ table.table > :not(caption) > * > * {
   width: 100%;
   height: auto;
   aspect-ratio: var(--slide-preview-aspect-ratio, 16 / 9);
+  object-fit: contain;
   border: 0;
   background: var(--bs-body-bg);
 }
 
+.slide-list-preview-frame[hidden] {
+  display: none;
+}
+
 #slide-preview-modal .modal-content {
   overflow: hidden;
 }