chore(*): Merge from master.

Author: MKirova

projects/igniteui-angular/src/lib/splitter/splitter-bar/splitter-bar.component.ts

@@ -204,7 +204,7 @@ export class IgxSplitBarComponent {
 
     protected get resizeDisallowed() {
         const relatedTabs = this.siblings;
-        return !!relatedTabs.find(x => x.resizable === false);
+        return !!relatedTabs.find(x => x.resizable === false || x.collapsed === true);
     }
 
     /**

projects/igniteui-angular/src/lib/splitter/splitter-pane/splitter-pane.component.ts

@@ -192,7 +192,6 @@ export class IgxSplitterPaneComponent {
         // reset sibling sizes when pane collapse state changes.
         this._getSiblings().forEach(sibling => sibling.size = 'auto');
         this.collapsed = !this.collapsed;
-        this.resizable = !this.collapsed;
         this.onToggle.emit(this);
     }
 

projects/igniteui-angular/src/lib/splitter/splitter.component.spec.ts

@@ -297,11 +297,19 @@ describe('IgxSplitter pane toggle', () => {
         const pane1 = splitter.panes.toArray()[0];
         const splitterBarComponent = fixture.debugElement.query(By.css(SPLITTERBAR_CLASS)).context;
 
+        pane1.size = '340';
+        const pane1_originalSize = pane1.size;
+        const splitterBarComponentDebug: DebugElement = fixture.debugElement.query(By.css(SPLITTERBAR_CLASS));
+
         // collapse left sibling pane
         splitterBarComponent.onCollapsing(0);
         fixture.detectChanges();
         expect(pane1.collapsed).toBeTruthy();
-        expect(pane1.resizable).toBeFalsy();
+        expect(pane1.resizable).toBeTruthy();
+        splitterBarComponentDebug.nativeElement.focus();
+        UIInteractions.triggerEventHandlerKeyDown('ArrowRight', splitterBarComponentDebug);
+        fixture.detectChanges();
+        expect(pane1.size).toEqual(pane1_originalSize);
 
         splitterBarComponent.onCollapsing(1);
         fixture.detectChanges();