Fix the scroll issue on focus cell

Section size was wrong so when we scroll the sheet section seems out of
visible area.
In this patch we are using the actaul section size.

Signed-off-by: Gülşah Köse <[email protected]>
Change-Id: I58cdc19c79210ecc1e925c8efd0b3313b68823ef

Author: GulsahKose

browser/src/canvas/sections/FocusCellSection.ts

@@ -40,8 +40,8 @@ class FocusCellSection extends CanvasSectionObject {
 	}
 
 	public onCellAddressChanged(): void {
-		this.size[0] = app.calc.cellCursorRectangle.pWidth;
-		this.size[1] = app.calc.cellCursorRectangle.pHeight;
+		this.size[0] = app.calc.cellCursorRectangle.pWidth * this.sectionProperties.maxRow;
+		this.size[1] = app.calc.cellCursorRectangle.pHeight * this.sectionProperties.maxCol;
 		this.setPosition(
 			app.calc.cellCursorRectangle.pX1,
 			app.calc.cellCursorRectangle.pY1,