fix(symbols): keep visual selection while selecting range (#3128)

When selectRange is missing and use visual mode, we should reselect
the selection.

An edge case like the current range is the same as the range that
language server returned, coc will make n/vim lose the selection.

src/handler/symbols.ts

@@ -121,7 +121,11 @@ export default class Symbols {
       let endLine = doc.getline(end.line - 1)
       selectRange = Range.create(start.line + 1, line.match(/^\s*/)[0].length, end.line - 1, endLine.length)
     }
-    if (selectRange) await workspace.selectRange(selectRange)
+    if (selectRange) {
+      await workspace.selectRange(selectRange)
+    } else if (['v', 'V', '\x16'].includes(visualmode)) {
+      await this.nvim.command('normal! gv')
+    }
   }
 
   public dispose(): void {

src/workspace.ts

@@ -642,7 +642,7 @@ export class Workspace implements IWorkspace {
   public async selectRange(range: Range): Promise<void> {
     let { nvim } = this
     let { start, end } = range
-    let [bufnr, ve, selection] = await nvim.eval(`[bufnr('%'), &virtualedit, &selection, mode()]`) as [number, string, string, string]
+    let [bufnr, ve, selection] = await nvim.eval(`[bufnr('%'), &virtualedit, &selection]`) as [number, string, string, string]
     let document = this.getDocument(bufnr)
     if (!document) return
     let line = document.getline(start.line)