N°3685 Greatly optimize SCSS rules to reduce compiled CSS file size (4.7Mo -> 620ko)

css/backoffice/application/display-block/_block-csv.scss

@@ -11,7 +11,5 @@ $ibo-block-csv--textarea--margin-top: 10px !default;
 }
 
 .ibo-block-csv--download-link{
-  @extend .ibo-button;
-  @extend .ibo-is-alternative;
-  @extend .ibo-is-primary;
+  @extend .ibo-button.ibo-is-alternative.ibo-is-primary;
 }

css/backoffice/components/_prop.scss

@@ -42,7 +42,6 @@ $ibo-prop--apply--error--color: $ibo-color-grey-800 !default;
 		height: $ibo-prop--apply-cancel--span--height;
 		width: $ibo-prop--apply-cancel--span--width;
 		text-align: center;
-		@extend .ibo-button;
-		@extend .ibo-is-alternative;
+		@extend .ibo-button.ibo-is-alternative;
 	}
 }

css/backoffice/components/_search-form.scss

@@ -847,9 +847,7 @@ $ibo-search-results-area--datatable-scrollhead--border--is-sticking: $ibo-search
 	
 	button {
 		margin-top: 8px;
-		@extend .ibo-button;
-		@extend .ibo-is-primary;
-		@extend .ibo-is-regular;
+		@extend .ibo-button.ibo-is-primary.ibo-is-regular;
 		> span {
 			margin-right: 0.5em;
 		}
@@ -877,8 +875,7 @@ $ibo-search-results-area--datatable-scrollhead--border--is-sticking: $ibo-search
 }
 
 .sfc_fg_button{
-	@extend .ibo-button;
-	@extend .ibo-is-neutral;
+	@extend .ibo-button.ibo-is-neutral;
 	&.sfc_fg_search, &.sfc_fg_apply, &.sfc_fg_cancel {
 		@extend .ibo-is-regular;
 	}

css/backoffice/components/input/_input-datetime.scss

@@ -25,9 +25,7 @@ $ibo-input-datetime--ui-tpicker-slider--padding-right: 18px !default;
 	color: $ibo-input-datetime--action-button--color;
 }
 .ui-datepicker-current, .ui-datepicker-close{
-	@extend .ibo-button;
-	@extend .ibo-is-regular;
-	@extend .ibo-is-secondary;
+	@extend .ibo-button.ibo-is-regular.ibo-is-secondary;
 }
 .ui_tpicker_hour_slider, .ui_tpicker_minute_slider, .ui_tpicker_second_slider{
 	@extend .ibo-input-wrapper;

css/backoffice/layout/dashboard/_dashboard-editor.scss

@@ -100,9 +100,7 @@ $ibo-dashboard-editor--delete-dashlet-icon--z-index: 21 !default;
 	right: $ibo-dashboard-editor--delete-dashlet-icon--right;
 	padding: $ibo-dashboard-editor--delete-dashlet-icon--padding;
 	z-index: $ibo-dashboard-editor--delete-dashlet-icon--z-index;
-	@extend .ibo-button;
-	@extend .ibo-is-alternative;
-	@extend .ibo-is-danger;
+	@extend .ibo-button.ibo-is-alternative.ibo-is-danger;
 }
 .ibo-dashboard-editor .itop-dashboard{
   a{

css/backoffice/vendors/_jqueryui.scss

@@ -167,9 +167,7 @@ $ibo-vendors-jqueryui--ui-slider--ui-slider-handle--hover--border-color: $ibo-co
 		top: 0;
 	}
 	.ui-button {
-		@extend .ibo-button;
-		@extend .ibo-is-regular;
-		@extend .ibo-is-secondary;
+		@extend .ibo-button.ibo-is-regular.ibo-is-secondary;
 		> .ui-icon {
 			background-image: none;
 			float: unset;