Merge pull request rstudio#8517 from rstudio/feature/suppress-tab-nav…

…igation

prevent navigation when hitting tab in visual mode

src/gwt/panmirror/src/editor/src/api/basekeys.ts

@@ -82,6 +82,10 @@ export function baseKeysPlugin(keys: readonly BaseKeyBinding[]): Plugin {
  { key: BaseKey.Backspace, command: joinBackward },
  { key: BaseKey.Backspace, command: deleteSelection },
 
+ // base tab key behavior (ignore)
+ { key: BaseKey.Tab, command: ignoreKey },
+ { key: BaseKey.ShiftTab, command: ignoreKey },
+
  // base delete key behaviors
  { key: BaseKey.Delete, command: selectNodeForward },
  { key: BaseKey.Delete, command: joinForward },
@@ -154,6 +158,10 @@ interface Coords {
  bottom: number;
 }
 
+function ignoreKey(state: EditorState, dispatch?: (tr: Transaction) => void) {
+ return true;
+}
+
 function homeKey(state: EditorState, dispatch?: (tr: Transaction) => void, view?: EditorView) {
  const selection = state.selection;
  const editingNode = editingRootNode(selection);