Don't collapse "target comment" when linked to one

This uses the CSS :not(:target) selector to make collapsing have no
effect on the "target comment" (the one that's being linked to or
navigated to using the Link/Parent links).

This isn't really a full solution and the collapsing button will still
toggle between + and - when clicked, but it's an improvement anyway.

tildes/scss/_themes.scss

@@ -119,7 +119,7 @@
     .label-comment-tag-flame { @include specialtag($comment-tag-flame-color, $is-light); }
   }
 
-  %collapsed {
+  %collapsed-theme {
     header {
       background-color: $background-color;
       color: $text-secondary-color;
@@ -130,13 +130,13 @@
     }
   }
 
-  .is-comment-collapsed {
-    @extend %collapsed;
+  .is-comment-collapsed:not(:target) {
+    @extend %collapsed-theme;
   }
 
-  .is-comment-collapsed-individual {
+  .is-comment-collapsed-individual:not(:target) {
     & > .comment-itself {
-      @extend %collapsed;
+      @extend %collapsed-theme;
     }
   }
 

tildes/scss/modules/_comment.scss

@@ -148,7 +148,7 @@
   }
 }
 
-.is-comment-collapsed {
+.is-comment-collapsed:not(:target) {
   @extend %collapsed;
 
   &[data-comment-depth="0"] {
@@ -162,7 +162,7 @@
 
 // uses @extend to only collapse everything inside the collapsed comment itself and
 // not its replies
-.is-comment-collapsed-individual {
+.is-comment-collapsed-individual:not(:target) {
   & > .comment-itself {
     @extend %collapsed;
   }