fix(datagrid): skip focusing active cell if focus outside component (#…

…1545)

## PR Checklist

Please check if your PR fulfills the following requirements:

- [ ] Tests for the changes have been added (for bug fixes / features)
- [ ] Docs have been added / updated (for bug fixes / features)
- [ ] If applicable, have a visual design approval

## PR Type

What kind of change does this PR introduce?

<!-- Please check the one that applies to this PR using "x". -->

- [X] Bugfix
- [ ] Feature
- [ ] Code style update (formatting, local variables)
- [ ] Refactoring (no functional changes, no api changes)
- [ ] Build related changes
- [ ] CI related changes
- [ ] Documentation content changes
- [ ] Other... Please describe:

## What is the current behavior?

If you change the items inside datagrid trough outside filter and
previously it was clicked on any cell then the datagrid will steal the
focus.

<!-- Please describe the current behavior that you are modifying, or
link to a relevant issue. -->

Issue Number: CDE-2273 #1542

## What is the new behavior?

Keep focus on the element

## Does this PR introduce a breaking change?

- [ ] Yes
- [X] No

<!-- If this PR contains a breaking change, please describe the impact
and migration path for existing applications below. -->

## Other information

(cherry picked from commit 7733e6b)

projects/angular/src/data/datagrid/datagrid.ts

@@ -290,12 +290,14 @@ export class ClrDatagrid<T = any> implements AfterContentInit, AfterViewInit, On
         }
 
         // retain active cell when navigating with Up/Down Arrows, PageUp and PageDown buttons in virtual scroller
-        const active = this.keyNavigation.getActiveCell();
-
-        if (active) {
-          this.zone.runOutsideAngular(() => {
-            setTimeout(() => this.keyNavigation.setActiveCell(active));
-          });
+        if (this.hasVirtualScroller) {
+          const active = this.keyNavigation.getActiveCell();
+          const isFocusInsideDatagrid = this.datagrid.nativeElement.contains(document.activeElement);
+          if (active && isFocusInsideDatagrid) {
+            this.zone.runOutsideAngular(() => {
+              setTimeout(() => this.keyNavigation.setActiveCell(active));
+            });
+          }
         }
       })
     );