fix DECSTBM with LF

fixtures/escape_sequence_files/t0070-DECSTBM_LF.in

@@ -27,5 +27,5 @@ r
 s
 t
 uvwxyz
-
+
 The end.

fixtures/escape_sequence_files/t0070-DECSTBM_LF.text

@@ -1,25 +1,25 @@
-1
- 2
-     6
-      7
-       8
-        9                                                                    ABC
+6
+7
+8
+9                                                                            ABC
 DEF
    a
-    b
-     c
-      d
-       e
-        f
-         g
-          h
-           i
-            j
-             k
-              l
-               m
-                n
-                 o
-                  p
-yz                 qrstu                                                     vwx
+b
+c
+d
+e
+f
+g
+h
+i
+j
+k
+l
+m
+n
+o
+p
+q
+yz                                                                           vwx
 The end.
+

src/InputHandler.ts

@@ -412,10 +412,13 @@ export class InputHandler extends Disposable implements IInputHandler {
         if (wraparoundMode) {
           buffer.x = 0;
           buffer.y++;
-          if (buffer.y > buffer.scrollBottom) {
+          if (buffer.y === buffer.scrollBottom + 1) {
             buffer.y--;
             this._terminal.scroll(true);
           } else {
+            if (buffer.y >= this._bufferService.rows) {
+              buffer.y = this._bufferService.rows - 1;
+            }
             // The line already exists (eg. the initial viewport), mark it as a
             // wrapped line
             buffer.lines.get(buffer.y).isWrapped = true;
@@ -508,9 +511,11 @@ export class InputHandler extends Disposable implements IInputHandler {
       buffer.x = 0;
     }
     buffer.y++;
-    if (buffer.y > buffer.scrollBottom) {
+    if (buffer.y === buffer.scrollBottom + 1) {
       buffer.y--;
       this._terminal.scroll();
+    } else if (buffer.y >= this._bufferService.rows) {
+      buffer.y = this._bufferService.rows - 1;
     }
     // If the end of the line is hit, prevent this action from wrapping around to the next line.
     if (buffer.x >= this._bufferService.cols) {

src/Terminal2.test.ts

@@ -17,7 +17,7 @@ const ROWS = 25;
 
 const TESTFILES = glob.sync('**/escape_sequence_files/*.in', { cwd: path.join(__dirname, '..')});
 const SKIP_FILES = [
-  't0070-DECSTBM_LF.in',      // lineFeed not working correctly
+  // 't0070-DECSTBM_LF.in',      // lineFeed not working correctly
   't0071-DECSTBM_IND.in',
   't0072-DECSTBM_NEL.in',
   't0075-DECSTBM_CUU_CUD.in',
@@ -42,7 +42,7 @@ const FILES = TESTFILES.filter(value => SKIP_FILES.indexOf(value.split('/').slic
 
 
 describe('Escape Sequence Files', function(): void {
-  this.timeout(20000);
+  this.timeout(100);
 
   let ptyTerm: any;
   let slaveEnd: any;