Merge pull request #3398 from Puneethnaik/issue_3074_fix

A way to turn off the scrollbar #3074

Author: Tyriar

demo/client.ts

@@ -349,6 +349,9 @@ function initOptions(term: TerminalType): void {
       } else if (o === 'lineHeight' || o === 'scrollSensitivity') {
         term.setOption(o, parseFloat(input.value));
         updateTerminalSize();
+      } else if(o === 'scrollback') {
+        term.setOption(o, parseInt(input.value));
+        setTimeout(() => updateTerminalSize(), 5);
       } else {
         term.setOption(o, parseInt(input.value));
       }

src/browser/Viewport.ts

@@ -23,6 +23,7 @@ export class Viewport extends Disposable implements IViewport {
   private _lastRecordedBufferHeight: number = 0;
   private _lastTouchY: number = 0;
   private _lastScrollTop: number = 0;
+  private _lastHadScrollBar: boolean = false;
 
   // Stores a partial line amount when scrolling, this is used to keep track of how much of a line
   // is scrolled so we can "scroll" over partial lines and feel natural on touchpads. This is a
@@ -47,6 +48,7 @@ export class Viewport extends Disposable implements IViewport {
     // Unfortunately the overlay scrollbar would be hidden underneath the screen element in that case,
     // therefore we account for a standard amount to make it visible
     this.scrollBarWidth = (this._viewportElement.offsetWidth - this._scrollArea.offsetWidth) || FALLBACK_SCROLL_BAR_WIDTH;
+    this._lastHadScrollBar = true;
     this.register(addDisposableDomListener(this._viewportElement, 'scroll', this._onScroll.bind(this)));
 
     // Perform this async to ensure the ICharSizeService is ready.
@@ -94,8 +96,18 @@ export class Viewport extends Disposable implements IViewport {
       this._viewportElement.scrollTop = scrollTop;
     }
 
+    // Update scroll bar width
+    if (this._optionsService.options.scrollback === 0) {
+      this.scrollBarWidth = 0;
+    } else {
+      this.scrollBarWidth = (this._viewportElement.offsetWidth - this._scrollArea.offsetWidth) || FALLBACK_SCROLL_BAR_WIDTH;
+    }
+    this._lastHadScrollBar = this.scrollBarWidth > 0;
+
+    this._viewportElement.style.width = (this._renderService.dimensions.actualCellWidth * (this._bufferService.cols) + this.scrollBarWidth).toString() + 'px';
     this._refreshAnimationFrame = null;
   }
+
   /**
    * Updates dimensions and synchronizes the scroll area if necessary.
    */
@@ -131,6 +143,11 @@ export class Viewport extends Disposable implements IViewport {
       this._refresh(immediate);
       return;
     }
+
+    // If the scroll bar visibility changed
+    if (this._lastHadScrollBar !== (this._optionsService.options.scrollback > 0)) {
+      this._refresh(immediate);
+    }
   }
 
   /**