Merge pull request #1736 from jerch/fix_bufferline_resize

fix BufferLine resize

Author: jerch

src/BufferLine.test.ts

@@ -133,4 +133,31 @@ describe('BufferLine', function(): void {
     const line3 = line.clone();
     chai.expect(TestBufferLine.prototype.toArray.apply(line3)).eql(line.toArray());
   });
+  it('resize enlarge', function(): void {
+    const line = new TestBufferLine(5, [1, 'a', 0, 'a'.charCodeAt(0)], false);
+    line.resize(10, [1, 'a', 0, 'a'.charCodeAt(0)]);
+    chai.expect(line.toArray()).eql(Array(10).fill([1, 'a', 0, 'a'.charCodeAt(0)]));
+  });
+  it('resize shrink(true)', function(): void {
+    const line = new TestBufferLine(10, [1, 'a', 0, 'a'.charCodeAt(0)], false);
+    line.resize(5, [1, 'a', 0, 'a'.charCodeAt(0)], true);
+    chai.expect(line.toArray()).eql(Array(5).fill([1, 'a', 0, 'a'.charCodeAt(0)]));
+  });
+  it('resize shrink(false)', function(): void {
+    const line = new TestBufferLine(10, [1, 'a', 0, 'a'.charCodeAt(0)], false);
+    line.resize(5, [1, 'a', 0, 'a'.charCodeAt(0)], false);
+    chai.expect(line.toArray()).eql(Array(5).fill([1, 'a', 0, 'a'.charCodeAt(0)]));
+  });
+  it('resize shrink(false) + shrink(false)', function(): void {
+    const line = new TestBufferLine(20, [1, 'a', 0, 'a'.charCodeAt(0)], false);
+    line.resize(10, [1, 'a', 0, 'a'.charCodeAt(0)], false);
+    line.resize(5, [1, 'a', 0, 'a'.charCodeAt(0)], false);
+    chai.expect(line.toArray()).eql(Array(5).fill([1, 'a', 0, 'a'.charCodeAt(0)]));
+  });
+  it('resize shrink(false) + enlarge', function(): void {
+    const line = new TestBufferLine(20, [1, 'a', 0, 'a'.charCodeAt(0)], false);
+    line.resize(10, [1, 'a', 0, 'a'.charCodeAt(0)], false);
+    line.resize(15, [1, 'a', 0, 'a'.charCodeAt(0)]);
+    chai.expect(line.toArray()).eql(Array(15).fill([1, 'a', 0, 'a'.charCodeAt(0)]));
+  });
 });

src/BufferLine.ts

@@ -218,7 +218,11 @@ export class BufferLineTypedArray implements IBufferLine {
     if (cols > this.length) {
       const data = new Uint32Array(cols * CELL_SIZE);
       if (this._data) {
-        data.set(this._data);
+        if (cols * CELL_SIZE < this._data.length) {
+          data.set(this._data.subarray(0, cols * CELL_SIZE));
+        } else {
+          data.set(this._data);
+        }
       }
       this._data = data;
       for (let i = this.length; i < cols; ++i) {