fix(codehints): stop unselected snippet badge from wrapping to a blank line

.custom-snippet-code-hint (the "Snippet" badge on default-snippet hint
rows) was only position: absolute while its row was highlighted. When
unhighlighted it fell back to static positioning with just
visibility: hidden - which still reserves layout space - so the
invisible badge text wrapped onto its own line inside the row,
leaving a blank line and shifting every hint below it down as soon as
selection moved off that row (e.g. pressing the down arrow).

Make the badge position: absolute unconditionally so it's out of flow
in both states; only visibility toggles with .highlight now.

Author: abose

src/styles/brackets_patterns_override.less

@@ -839,12 +839,13 @@ a:focus {
     line-height: inherit;
 }
 
+// Always absolutely positioned (not just while highlighted) so that when it's hidden
+// (visibility: hidden, below) it's taken out of normal flow entirely - otherwise, on a
+// static-positioned item that isn't highlighted, this label's own reserved inline box can
+// still wrap the row onto a second line, leaving a blank line behind and shifting every
+// hint below it down as selection moves off this item (see #618 follow-up).
 .custom-snippet-code-hint {
     visibility: hidden;
-}
-
-.codehint-menu .dropdown-menu li .highlight .custom-snippet-code-hint {
-    visibility: visible;
     position: absolute;
     right: 0;
     margin-top: -2px;
@@ -857,6 +858,10 @@ a:focus {
     }
 }
 
+.codehint-menu .dropdown-menu li .highlight .custom-snippet-code-hint {
+    visibility: visible;
+}
+
 .custom-snippets-hint {
     min-width: 200px !important;
     max-width: 350px !important;