Revert to cursor options after DECSCUSR 0

Fixes #3293

src/browser/renderer/dom/DomRenderer.ts

@@ -13,7 +13,7 @@ import { ICharSizeService, ICoreBrowserService, IThemeService } from 'browser/se
 import { ILinkifier2, ILinkifierEvent, ITerminal, ReadonlyColorSet } from 'browser/Types';
 import { color } from 'common/Color';
 import { Disposable, toDisposable } from 'vs/base/common/lifecycle';
-import { IBufferService, IInstantiationService, IOptionsService } from 'common/services/Services';
+import { IBufferService, ICoreService, IInstantiationService, IOptionsService } from 'common/services/Services';
 import { Emitter } from 'vs/base/common/event';
 
 
@@ -59,6 +59,7 @@ export class DomRenderer extends Disposable implements IRenderer {
     @ICharSizeService private readonly _charSizeService: ICharSizeService,
     @IOptionsService private readonly _optionsService: IOptionsService,
     @IBufferService private readonly _bufferService: IBufferService,
+    @ICoreService private readonly _coreService: ICoreService,
     @ICoreBrowserService private readonly _coreBrowserService: ICoreBrowserService,
     @IThemeService private readonly _themeService: IThemeService
   ) {
@@ -437,8 +438,8 @@ export class DomRenderer extends Disposable implements IRenderer {
     const buffer = this._bufferService.buffer;
     const cursorAbsoluteY = buffer.ybase + buffer.y;
     const cursorX = Math.min(buffer.x, this._bufferService.cols - 1);
-    const cursorBlink = this._optionsService.rawOptions.cursorBlink;
-    const cursorStyle = this._optionsService.rawOptions.cursorStyle;
+    const cursorBlink = this._coreService.decPrivateModes.cursorBlink ?? this._optionsService.rawOptions.cursorBlink;
+    const cursorStyle = this._coreService.decPrivateModes.cursorStyle ?? this._optionsService.rawOptions.cursorStyle;
     const cursorInactiveStyle = this._optionsService.rawOptions.cursorInactiveStyle;
 
     for (let y = start; y <= end; y++) {

src/common/InputHandler.ts

@@ -2714,7 +2714,7 @@ export class InputHandler extends Disposable implements IInputHandler {
 
   /**
    * CSI Ps SP q  Set cursor style (DECSCUSR, VT520).
-   *   Ps = 0  -> blinking block.
+   *   Ps = 0  -> reset to option.
    *   Ps = 1  -> blinking block (default).
    *   Ps = 2  -> steady block.
    *   Ps = 3  -> blinking underline.
@@ -2724,7 +2724,8 @@ export class InputHandler extends Disposable implements IInputHandler {
    *
    * @vt: #Y CSI DECSCUSR  "Set Cursor Style"  "CSI Ps SP q"   "Set cursor style."
    * Supported cursor styles:
-   *  - empty, 0 or 1: steady block
+   *  - empty, 0: reset to option
+   *  - 1: steady block
    *  - 2: blink block
    *  - 3: steady underline
    *  - 4: blink underline
@@ -2732,23 +2733,30 @@ export class InputHandler extends Disposable implements IInputHandler {
    *  - 6: blink bar
    */
   public setCursorStyle(params: IParams): boolean {
-    const param = params.params[0] || 1;
-    switch (param) {
-      case 1:
-      case 2:
-        this._optionsService.options.cursorStyle = 'block';
-        break;
-      case 3:
-      case 4:
-        this._optionsService.options.cursorStyle = 'underline';
-        break;
-      case 5:
-      case 6:
-        this._optionsService.options.cursorStyle = 'bar';
-        break;
+    const param = params.params[0] ?? 1;
+    if (param === 0) {
+      this._coreService.decPrivateModes.cursorStyle = undefined;
+      this._coreService.decPrivateModes.cursorBlink = undefined;
+    } else {
+      switch (param) {
+        case 0:
+          break;
+        case 1:
+        case 2:
+          this._coreService.decPrivateModes.cursorStyle = 'block';
+          break;
+        case 3:
+        case 4:
+          this._coreService.decPrivateModes.cursorStyle = 'underline';
+          break;
+        case 5:
+        case 6:
+          this._coreService.decPrivateModes.cursorStyle = 'bar';
+          break;
+      }
+      const isBlinking = param % 2 === 1;
+      this._coreService.decPrivateModes.cursorBlink = isBlinking;
     }
-    const isBlinking = param % 2 === 1;
-    this._optionsService.options.cursorBlink = isBlinking;
     return true;
   }
 

src/common/TestUtils.test.ts

@@ -89,6 +89,8 @@ export class MockCoreService implements ICoreService {
     applicationCursorKeys: false,
     applicationKeypad: false,
     bracketedPasteMode: false,
+    cursorBlink: undefined,
+    cursorStyle: undefined,
     origin: false,
     reverseWraparound: false,
     sendFocus: false,

src/common/Types.ts

@@ -268,6 +268,8 @@ export interface IDecPrivateModes {
   applicationCursorKeys: boolean;
   applicationKeypad: boolean;
   bracketedPasteMode: boolean;
+  cursorBlink: boolean | undefined;
+  cursorStyle: CursorStyle | undefined;
   origin: boolean;
   reverseWraparound: boolean;
   sendFocus: boolean;

src/common/services/CoreService.ts

@@ -17,6 +17,8 @@ const DEFAULT_DEC_PRIVATE_MODES: IDecPrivateModes = Object.freeze({
   applicationCursorKeys: false,
   applicationKeypad: false,
   bracketedPasteMode: false,
+  cursorBlink: undefined,
+  cursorStyle: undefined,
   origin: false,
   reverseWraparound: false,
   sendFocus: false,