Fix translateToString endCol default arg

src/Buffer.ts

@@ -275,7 +275,7 @@ export class Buffer implements IBuffer {
    * @param startCol The column to start at.
    * @param endCol The column to end at.
    */
-  public translateBufferLineToString(lineIndex: number, trimRight: boolean, startCol: number = 0, endCol: number = null): string {
+  public translateBufferLineToString(lineIndex: number, trimRight: boolean, startCol: number = 0, endCol?: number): string {
     const line = this.lines.get(lineIndex);
     if (!line) {
       return '';

src/BufferLine.test.ts

@@ -325,5 +325,10 @@ describe('BufferLine', function(): void {
       chai.expect(line.translateToString(false)).equal('          ');
       chai.expect(line.translateToString(true)).equal('');
     });
+    it('should work with endCol=0', () => {
+      const line = new TestBufferLine(10, [DEFAULT_ATTR, NULL_CELL_CHAR, 0, NULL_CELL_CODE], false);
+      line.set(0, [1, 'a', 1, 'a'.charCodeAt(0)]);
+      chai.expect(line.translateToString(true, 0, 0)).equal('');
+    });
   });
 });

src/BufferLine.ts

@@ -118,13 +118,12 @@ export class BufferLineJSArray implements IBufferLine {
     return 0;
   }
 
-  public translateToString(trimRight: boolean = false, startCol: number = 0, endCol: number = null): string {
-    let length = endCol || this.length;
+  public translateToString(trimRight: boolean = false, startCol: number = 0, endCol: number = this.length): string {
     if (trimRight) {
-      length = Math.min(length, this.getTrimmedLength());
+      endCol = Math.min(endCol, this.getTrimmedLength());
     }
     let result = '';
-    while (startCol < length) {
+    while (startCol < endCol) {
       result += this.get(startCol)[CHAR_DATA_CHAR_INDEX] || WHITESPACE_CELL_CHAR;
       startCol += this.get(startCol)[CHAR_DATA_WIDTH_INDEX] || 1;
     }
@@ -305,13 +304,12 @@ export class BufferLine implements IBufferLine {
     return 0;
   }
 
-  public translateToString(trimRight: boolean = false, startCol: number = 0, endCol: number = null): string {
-    let length = endCol || this.length;
+  public translateToString(trimRight: boolean = false, startCol: number = 0, endCol: number = this.length): string {
     if (trimRight) {
-      length = Math.min(length, this.getTrimmedLength());
+      endCol = Math.min(endCol, this.getTrimmedLength());
     }
     let result = '';
-    while (startCol < length) {
+    while (startCol < endCol) {
       const stringData = this._data[startCol * CELL_SIZE + Cell.STRING];
       result += (stringData & IS_COMBINED_BIT_MASK) ? this._combined[startCol] : (stringData) ? String.fromCharCode(stringData) : WHITESPACE_CELL_CHAR;
       startCol += this._data[startCol * CELL_SIZE + Cell.WIDTH] || 1;

src/SelectionManager.ts

@@ -198,7 +198,7 @@ export class SelectionManager extends EventEmitter implements ISelectionManager
       }
     } else {
       // Get first row
-      const startRowEndCol = start[1] === end[1] ? end[0] : null;
+      const startRowEndCol = start[1] === end[1] ? end[0] : undefined;
       result.push(this._buffer.translateBufferLineToString(start[1], true, start[0], startRowEndCol));
 
       // Get middle rows