BUG with select all checkbox

[ghost]

Describe the bug
Checkbox "Select all / unselect all" is checked even if not all list elements are checked

To Reproduce
https://stackblitz.com/github/bithost-gmbh/ngx-mat-select-search-example

1. click in "Tooltip on the Select All Checkbox"
2. type "J"
3. click checkbox "Select all / unselect all" -> "Bank J (Italy)" and checkbox "Select all / unselect all" is checked
4. close list by clicking outside
5. click in "Tooltip on the Select All Checkbox"
6. ERROR -> checkbox "Select all / unselect all" is checked, although only "Bank J (Italy)" is checked

Expected behavior
Checkbox "Select all / unselect all" shouldn't be checked

Screenshots

Desktop (please complete the following information):
OS: Windows 10
Browser Google Chrome
Version 92.0.4515.159

Smartphone (please complete the following information):

Additional context

[macjohnny]

do you want to fix the examples?

[ghost]

I only mentioned the examples, because it's the same behavior as in my application.

As you can see below, I added [toggleAllCheckboxChecked]="allSelectedChecked.locations" to my ngx-mat-select-search.
For test purposes I added (focus)="onFocusFilter()" to my mat-select with a console.log('----- onFocusFilter() this.allSelectedChecked', this.allSelectedChecked['locations']);
Even if this.allSelectedChecked['locations'] is false, the all checkbox is checked.

<mat-select multiple (focus)="onFocusFilter()" [ngModel]="inputFields?.locations" (ngModelChange)="inputFields.locations = $event; filtersChanged()">
  <mat-option>
    <ngx-mat-select-search [showToggleAllCheckbox]="true" (toggleAll)="toggleAllSelection($event, 'locations'); filtersChanged()"
                           [toggleAllCheckboxChecked]="allSelectedChecked.locations"
                           [toggleAllCheckboxTooltipMessage]="translations?.selectUnselectAll" [toogleAllCheckboxTooltipPosition]="'above'"
                           [alwaysRestoreSelectedOptionsMulti]="true" [formControl]="locationFilterCtrl"
                           placeholderLabel="{{ translations?.search }}" noEntriesFoundLabel="{{ translations?.noResultsFound }}">
      <mat-icon ngxMatSelectSearchClear>clear</mat-icon>
    </ngx-mat-select-search>
  </mat-option>
  <mat-option *ngFor="let location of filterOptionsFiltered?.locations"
              [value]="location?.id">
    {{ location?.name }}
  </mat-option>
</mat-select>

[AhsanAyaz]

@macjohnny can you mark this issue for hacktoberfest? Thanks

[macjohnny]

@AhsanAyaz I added the topic "hacktoberfest" to this repo, this should be enough, right?

[AhsanAyaz]

@macjohnny , yeah I believe so!
And thanks 🙂