[CLEANUP] Remove invalid :has CSS definition

There is a css rule containing a `:has()` rule.
This rule is not supported in any browser yet and
there must be also no whitespace between the `:has` and
the opening brace.

Resolves: #79890
Releases: master
Change-Id: Ief60c287f1bd0f95c6b61fde0e6f50704978357f
Reviewed-on: https://review.typo3.org/51739


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Josef Glatz <josef.glatz@typo3.org>
Reviewed-by: Tymoteusz Motylewski <t.motylewski@gmail.com>
Tested-by: Tymoteusz Motylewski <t.motylewski@gmail.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>

Build/Resources/Public/Less/form.less

@@ -528,9 +528,6 @@
           transition: margin @stage-validation-transition-time-in;
         }
       }
-      &:has (.ui-sortable-handle:hover) {
-        border-color: transparent;
-      }
       span {
         color: @gray-dark;
       }
@@ -963,4 +960,4 @@
 .t3-form-element-new-page-button {
   position: absolute;
   left: 0.5em;
-}
\ No newline at end of file
+}

typo3/sysext/form/Resources/Public/Css/form.css

@@ -385,9 +385,6 @@
   margin-right: 75px;
   transition: margin 0.2s;
 }
-#t3-form-stage-container.t3-form-stage-viewmode-abstract .ui-sortable-handle:has (.ui-sortable-handle:hover) {
-  border-color: transparent;
-}
 #t3-form-stage-container.t3-form-stage-viewmode-abstract .ui-sortable-handle span {
   color: #5a5a5a;
 }