Set scroll position at top of the textarea when opening the subtitle editor.

## Description

This set the position of the scrollbar at the top of the textarea when opening the __subtitle editor__.
Previously the textarea scroll position was at the bottom of the textarea which doesn't make much sense when you want to edit a subtitle : you most likely want to edit the beginning of the subtitle first.

This also set the caret position on the first character.

## Design decision

I had to use a *component approach* instead of an `<ng-template>` for the edition modal because the `@viewChild` directive doesn't work for elements __inside__ an `<ng-template>`.
I needed the `viewChild` directive to get an `ElementRef` of the `textarea`.

> See the following issue and its workaround :
> - https://github.com/valor-software/ngx-bootstrap/issues/3825
> - https://stackblitz.com/edit/angular-t5dfp7
> - https://medium.com/@izzatnadiri/how-to-pass-data-to-and-receive-from-ng-bootstrap-modals-916f2ad5d66e

## Related issues
Closes [peertube-plugin-transcription/#39](https://gitlab.com/apps_education/peertube/plugin-transcription/-/issues/39)

1 files changed, 1 insertions, 8 deletions

diff --git a/client/src/app/+videos/+video-edit/shared/video-edit.component.html b/client/src/app/+videos/+video-edit/shared/video-edit.component.html
index de126bdf7..7be5a3736 100644
--- a/client/src/app/+videos/+video-edit/shared/video-edit.component.html
+++ b/client/src/app/+videos/+video-edit/shared/video-edit.component.html
@@ -185,7 +185,7 @@
 
                 <div i18n class="caption-entry-state">Already uploaded on {{ videoCaption.updatedAt | date }}   &#10004;</div>
 
-                <span i18n class="caption-entry-edit" (click)="videoCaptionEditModal.show()">Edit</span>
+                <span i18n class="caption-entry-edit" (click)="openEditCaptionModal(videoCaption)">Edit</span>
                 <span i18n class="caption-entry-delete" (click)="deleteCaption(videoCaption)">Delete</span>
               </ng-container>
 
@@ -212,13 +212,6 @@
 
                 <span i18n class="caption-entry-delete" (click)="deleteCaption(videoCaption)">Cancel deletion</span>
               </ng-container>
-
-              <my-video-caption-edit-modal
-                #videoCaptionEditModal
-                [videoCaption]="videoCaption"
-                [serverConfig]="serverConfig"
-                (captionEdited)="onCaptionEdited($event)"
-              ></my-video-caption-edit-modal>
             </div>
           </div>