fix: textarea height with multiline placeholder

Author: szuperaz

projects/stream-chat-angular/src/lib/message-input/autocomplete-textarea/autocomplete-textarea.component.spec.ts

@@ -468,7 +468,7 @@ describe('AutocompleteTextareaComponent', () => {
 
   it('should set initial height of the textarea based on value received', () => {
     const textarea = queryTextarea();
-    textarea!.value = 'This is my \n multiline message';
+    component.value = 'This is my \n multiline message';
     component.ngAfterViewInit();
     fixture.detectChanges();
 

projects/stream-chat-angular/src/lib/message-input/autocomplete-textarea/autocomplete-textarea.component.ts

@@ -229,7 +229,7 @@ export class AutocompleteTextareaComponent
       'info',
       '[Autocomplete textarea] View inited'
     );
-    if (this.messageInput.nativeElement.scrollHeight > 0) {
+    if (this.messageInput.nativeElement.scrollHeight > 0 && this.value) {
       this.adjustTextareaHeight();
     }
   }

projects/stream-chat-angular/src/lib/message-input/textarea/textarea.component.spec.ts

@@ -158,7 +158,7 @@ describe('TextareaComponent', () => {
 
   it('should set initial height of the textarea based on value received', () => {
     const textarea = queryTextarea();
-    textarea!.value = 'This is my \n multiline message';
+    component.value = 'This is my \n multiline message';
     component.ngAfterViewInit();
     fixture.detectChanges();
 

projects/stream-chat-angular/src/lib/message-input/textarea/textarea.component.ts

@@ -94,7 +94,7 @@ export class TextareaComponent
 
   ngAfterViewInit(): void {
     this.isViewInited = true;
-    if (this.messageInput.nativeElement.scrollHeight > 0) {
+    if (this.messageInput.nativeElement.scrollHeight > 0 && this.value) {
       this.adjustTextareaHeight();
     }
   }