fix: fix lost open animation of collapse (#827)

Author: mortalYoung

src/components/collapse/index.tsx

@@ -82,7 +82,7 @@ export function Collapse({
     const adjustedSize = useRef<number[]>([]);
     const first = useRef(true);
 
-    const isUndefined = (key): boolean => {
+    const isUndefined = (key: UniqueId): boolean => {
         return key === undefined;
     };
 
@@ -125,7 +125,7 @@ export function Collapse({
         return null;
     };
 
-    const handleChangeCallback = (key: UniqueId, index) => {
+    const handleChangeCallback = (key: UniqueId, index: number) => {
         const currentKeys = [...activePanelKeys];
         if (!isUndefined(currentKeys[index])) {
             delete currentKeys[index];

src/components/collapse/style.scss

@@ -15,14 +15,10 @@ $split_pane_visible: #{$split}__pane__item--visible;
     }
 
     &__pane {
-        &--collapsing {
-            transition: top ease-in-out 0.2s, height ease-in-out 0.2s;
-        }
+        transition: top ease-out 0.15s, height ease-out 0.15s;
 
-        &:not(#{$split_pane_visible} ~ #{$split_pane_visible}) {
-            #{$collapse}__header {
-                border-top: 0;
-            }
+        &:first-child #{$collapse}__header {
+            border-top-color: transparent;
         }
     }
 
@@ -43,14 +39,14 @@ $split_pane_visible: #{$split}__pane__item--visible;
 
     &__header {
         align-items: center;
-        border-top: 1px solid var(--sideBarSectionHeader-border);
+        border-bottom: 1px solid transparent;
+        border-top: 1px solid var(--sideBarSectionHeader-border, transparent);
         box-sizing: border-box;
         cursor: pointer;
         display: flex;
         font-size: 11px;
         font-weight: bold;
-        height: 25px;
-        outline: none;
+        height: 26px;
         outline: 1px solid transparent;
         outline-offset: -1px;
         padding: 1px 2px;

src/extensions/github-plus-theme-master/themes/github-plus-theme.json

@@ -39,9 +39,9 @@
         "scrollbar.shadow": "#00000000",
         "quickInputList.focusBackground": "#e7e6e5",
         "quickInputList.focusForeground": "#24292e",
+        "list.focusOutline": "#ffffff",
         "list.highlightForeground": "#0066BF",
         "list.focusHighlightForeground": "#0066BF",
-
         "terminal.background": "#ffffff",
         "terminal.foreground": "#333333",
         "terminal.ansiBlack": "#414141",