use the right numbers when computing the new sash ratio, fixes #6599

src/vs/editor/contrib/referenceSearch/browser/referencesWidget.ts

@@ -399,16 +399,19 @@ class VSash {
 			getVerticalSashHeight: () => this._height
 		});
 
-		let data: { startX: number, startRatio: number };
+		// compute the current widget clientX postion since
+		// the sash works with clientX when dragging
+		let clientX: number;
 		this._disposables.add(this._sash.addListener2('start', (e: ISashEvent) => {
-			data = { startX: e.startX, startRatio: this._ratio };
+			clientX = e.startX - (this._width * this.ratio);
 		}));
 
 		this._disposables.add(this._sash.addListener2('change', (e: ISashEvent) => {
-			let {currentX} = e;
-			let newRatio = data.startRatio * (currentX / data.startX);
-			if (newRatio > .05 && newRatio < .95) {
-				this._ratio = newRatio;
+			// compute the new position of the sash and from that
+			// compute the new ratio that we are using
+			let newLeft = e.currentX - clientX;
+			if (newLeft > 20 && newLeft + 20 < this._width) {
+				this._ratio = newLeft / this._width;
 				this._sash.layout();
 				this._onDidChangePercentages.fire(this);
 			}