fix(grid): using computed style for restrict resize

Author: Zneeky

projects/igniteui-angular/src/lib/grids/resizing/resizing.service.ts

@@ -61,7 +61,7 @@ export class IgxColumnResizingService {
      * Returns the minimal possible width to which the column can be resized.
      */
     public get restrictResizeMin(): number {
-        const actualWidth = this.getColumnHeaderRenderedWidth();
+        const actualWidth = parseFloat(window.getComputedStyle(this.column.headerCell.nativeElement).width);
         const minWidth = this.column.minWidthPx < actualWidth ? this.column.minWidthPx : actualWidth;
 
         return actualWidth - minWidth;
@@ -71,7 +71,7 @@ export class IgxColumnResizingService {
      * Returns the maximal possible width to which the column can be resized.
      */
     public get restrictResizeMax(): number {
-        const actualWidth = this.getColumnHeaderRenderedWidth();
+        const actualWidth = parseFloat(window.getComputedStyle(this.column.headerCell.nativeElement).width);
         const maxWidth = this.column.maxWidthPx;
         if (this.column.maxWidth) {
             return maxWidth - actualWidth;