fix navigation with rowheader

Navigating to left with keyboard can make it select the rowHeader. To
fix this, we check if rowHeader exists from SelectRange. Range is not
responsible for checking rowHeader for the most part anymore.

src/js/modules/SelectRange/Range.js

@@ -23,13 +23,6 @@ export default class Range extends CoreFeature{
 		this.start = {row:0, col:0};
 		this.end = {row:0, col:0};
 
-		if(this.rangeManager.rowHeader){
-			this.left = 1;
-			this.right = 1;
-			this.start.col = 1;
-			this.end.col = 1;
-		}
-
 		this.initElement();
 
 		setTimeout(() => {
@@ -84,21 +77,12 @@ export default class Range extends CoreFeature{
 	}
 
 	setStartBound(element){
-		var row, col;
-
 		if (element.type === "column") {
 			if(this.rangeManager.columnSelection){
 				this.setStart(0, element.getPosition() - 1);
 			}
 		}else{
-			row = element.row.position - 1;
-			col = element.column.getPosition() - 1;
-
-			if (element.column === this.rangeManager.rowHeader) {
-				this.setStart(row, 1);
-			} else {
-				this.setStart(row, col);
-			}
+			this.setStart(element.row.position - 1, element.column.getPosition() - 1);
 		}
 	}
 

src/js/modules/SelectRange/SelectRange.js

@@ -457,6 +457,10 @@ export default class SelectRange extends Module {
 					break;
 			}
 		}
+
+		if(this.rowHeader && nextCol === 0) {
+			nextCol = 1;
+		}
 
 		moved = nextCol !== rangeEdge.col || nextRow !== rangeEdge.row;