feat(split): allow closing any split pane

Author: SiriusXT

apps/client/src/widgets/buttons/close_pane_button.tsx

@@ -8,7 +8,7 @@ export default function ClosePaneButton() {
     const [ isEnabled, setIsEnabled ] = useState(false);
 
     function refresh() {
-        setIsEnabled(!!(noteContext && !!noteContext.mainNtxId));
+        setIsEnabled(!!noteContext);
     }
 
     useTriliumEvent("noteContextReorder", refresh);

apps/client/src/widgets/containers/split_note_container.ts

@@ -100,9 +100,23 @@ export default class SplitNoteContainer extends FlexContainer<SplitNoteWidget> {
     }
 
     async closeThisNoteSplitCommand({ ntxId }: CommandListenerData<"closeThisNoteSplit">) {
-        if (ntxId) {
-            await appContext.tabManager.removeNoteContext(ntxId);
+        if (!ntxId) return;
+        const contexts = appContext.tabManager.noteContexts;
+
+        const currentIndex = contexts.findIndex((c) => c.ntxId === ntxId);
+        if (currentIndex === -1) return;
+
+        const isRemoveMainContext = !contexts[currentIndex].mainNtxId;
+        if (isRemoveMainContext && currentIndex + 1 <= contexts.length) {
+            const ntxIds = contexts.map((c) => c.ntxId).filter((c) => !!c) as string[];
+            this.triggerCommand("noteContextReorder", {
+                ntxIdsInOrder: ntxIds,
+                oldMainNtxId: ntxId,
+                newMainNtxId: ntxIds[currentIndex + 1]
+            });
         }
+
+        await appContext.tabManager.removeNoteContext(ntxId);
     }
 
     async moveThisNoteSplitCommand({ ntxId, isMovingLeft }: CommandListenerData<"moveThisNoteSplit">) {