Add OpenExcerptsSplit (#8574)

I would like to keep diagnostics open on one side, and process them on
the other.


Release Notes:

- Added `editor::OpenExcerptsSplit` (bound to `cmd-k enter`) to open the
selected excerpts in the adjacent pane
- vim: Added `ctrl-w d`, `ctrl-w shift-d` and `ctrl-w space` for
`editor::GoTo{,Type}Definition` and `editor::OpenExcerptsSplit`

crates/language_tools/src/lsp_log.rs

@@ -93,7 +93,7 @@ pub fn init(cx: &mut AppContext) {
         workspace.register_action(move |workspace, _: &OpenLanguageServerLogs, cx| {
             let project = workspace.project().read(cx);
             if project.is_local() {
-                workspace.add_item(
+                workspace.add_item_to_active_pane(
                     Box::new(cx.new_view(|cx| {
                         LspLogView::new(workspace.project().clone(), log_store.clone(), cx)
                     })),