fix(module:upload): remove unnecessary checks (#1039)

close #1038

Author: cipchk

src/components/upload/nz-upload.component.ts

@@ -360,7 +360,7 @@ export class NzUploadComponent implements OnInit, OnChanges, OnDestroy {
   onRemove = (file: UploadFile): void => {
     this.upload.abort(file);
     file.status = 'removed';
-    (this.nzRemove ? this.nzRemove instanceof Observable ? this.nzRemove : of(this.nzRemove(file)) : of(true))
+    ((this.nzRemove ? this.nzRemove instanceof Observable ? this.nzRemove : of(this.nzRemove(file)) : of(true)) as Observable<any>)
       .pipe(filter((res: boolean) => res))
       .subscribe(res => {
         const removedFileList = this.removeFileItem(file, this.nzFileList);
@@ -411,13 +411,7 @@ export class NzUploadComponent implements OnInit, OnChanges, OnDestroy {
   }
 
   ngOnChanges(changes: { [P in keyof this]?: SimpleChange } & SimpleChanges): void {
-    if (changes.nzFileList) {
-      (this.nzFileList || []).forEach(file => file.message = this.genErr(file));
-      if (!changes.nzFileList.firstChange) return;
-    }
-    if (this.inited) {
-      if (changes.nzPreview || changes.nzCustomRequest || changes.nzBeforeUpload || changes.nzRemove) return;
-    }
+    if (changes.nzFileList) (this.nzFileList || []).forEach(file => file.message = this.genErr(file));
     this.zipOptions()._setClassMap();
   }
 

src/components/upload/nz-upload.spec.ts

@@ -25,13 +25,30 @@ describe('NzUpload', () => {
   it('should create an instance', () => {
     expect(instance).toBeTruthy();
   });
+
+  it('recreate bug https://github.com/NG-ZORRO/ng-zorro-antd/issues/1038', () => {
+    expect(instance.ref._btnOptions.disabled).toBe(false);
+    instance.fileList = [{
+      uid: -1,
+      name: 'xxx.png',
+      status: 'done',
+      url: 'https://zos.alipayobjects.com/rmsportal/jkjgkEfvpUPVyRjUImniVslZfWPnJuuZ.png',
+    }];
+    fixture.detectChanges();
+    expect(instance.ref._btnOptions.disabled).toBe(true);
+  });
 });
 
 @Component({
-  template: `<nz-upload #ref [nzShowUploadList]="false">Upload</nz-upload>`
+  template: `<nz-upload #ref
+  [(nzFileList)]="fileList"
+  [nzDisabled]="fileList.length >= 1"
+  [nzShowUploadList]="false">Upload</nz-upload>`
 })
 class TestComponent {
 
   @ViewChild('ref') ref: NzUploadComponent;
 
+  fileList = [];
+
 }