respect DECSTBM margins in DECOM mode

src/InputHandler.ts

@@ -615,11 +615,23 @@ export class InputHandler extends Disposable implements IInputHandler {
     } else if (this._terminal.buffer.y >= this._terminal.rows) {
       this._terminal.buffer.y = this._terminal.rows - 1;
     }
+    if (this._terminal.originMode) {
+      if (this._terminal.buffer.y < this._terminal.buffer.scrollTop) {
+        this._terminal.buffer.y = this._terminal.buffer.scrollTop;
+      } else if (this._terminal.buffer.y > this._terminal.buffer.scrollBottom) {
+        this._terminal.buffer.y = this._terminal.buffer.scrollBottom;
+      }
+    }
   }
 
   private _setCursor(x: number, y: number): void {
-    this._terminal.buffer.x = x;
-    this._terminal.buffer.y = y;
+    if (this._terminal.originMode) {
+      this._terminal.buffer.x = x;
+      this._terminal.buffer.y = this._terminal.buffer.scrollTop + y;
+    } else {
+      this._terminal.buffer.x = x;
+      this._terminal.buffer.y = y;
+    }
     this._restrictCursor();
   }
 

src/Terminal2.test.ts

@@ -136,9 +136,10 @@ if (os.platform() !== 'win32') {
       // 't0100-IRM.in',
       't0101-NLM.in',
       't0103-reverse_wrap.in',
-      't0504-vim.in',
+      't0504-vim.in'
+
       // vttest related files
-      't0300-vttest1.in'
+      // 't0300-vttest1.in'
     ];
     if (os.platform() === 'darwin') {
       // These are failing on macOS only