fix(tabs): prevent markdown blockquote parsing when nested in steps (#912)

* fix(tabs): prevent markdown blockquote parsing when nested in steps

Consolidate HTML attributes onto single lines and add proper whitespace
trimming to prevent `>` characters on separate lines from being
interpreted as markdown blockquotes when tabs are nested inside the
steps shortcode.

Fixes #876

* chore: add comment explaining single-line HTML requirement

Author: imfing

layouts/_partials/shortcodes/tabs.html

@@ -30,40 +30,20 @@
 {{- /* Generate a unique ID for each tab group. */ -}}
 {{- $globalID := printf "tabs-%02v" $tabsID -}}
 
+{{- /* Keep HTML on single lines to avoid `>` being parsed as blockquote when nested in steps (#876) */ -}}
 <div class="hextra-scrollbar hx:overflow-x-auto hx:overflow-y-hidden hx:overscroll-x-contain">
-  <div
-    class="hx:mt-4 hx:flex hx:w-max hx:min-w-full hx:border-b hx:border-gray-200 hx:pb-px hx:dark:border-neutral-800"
-    {{ if $enableSync }} data-tab-group="{{ delimit $dataTabGroup `,` }}"{{ end }}
-  >
+  <div class="hx:mt-4 hx:flex hx:w-max hx:min-w-full hx:border-b hx:border-gray-200 hx:pb-px hx:dark:border-neutral-800"{{- if $enableSync }} data-tab-group="{{ delimit $dataTabGroup `,` }}"{{- end }}>
     {{- range $i, $item := $tabs -}}
-      <button
-        class="hextra-tabs-toggle hx:cursor-pointer hx:data-[state=selected]:border-primary-500 hx:data-[state=selected]:text-primary-600 hx:data-[state=selected]:dark:border-primary-500 hx:data-[state=selected]:dark:text-primary-600 hx:mr-2 hx:rounded-t hx:p-2 hx:font-medium hx:leading-5 hx:transition-colors hx:-mb-0.5 hx:select-none hx:border-b-2 hx:border-transparent hx:text-gray-600 hx:hover:border-gray-200 hx:hover:text-black hx:dark:text-gray-200 hx:dark:hover:border-neutral-800 hx:dark:hover:text-white"
-        role="tab"
-        type="button"
-        aria-controls="tabs-panel-{{ $globalID }}-{{ $item.id }}"
-        {{- if eq $i $selectedIndex -}}
-        aria-selected="true"
-        tabindex="0"
-        data-state="selected"
-        {{- end }}
-      >
+      <button class="hextra-tabs-toggle hx:cursor-pointer hx:data-[state=selected]:border-primary-500 hx:data-[state=selected]:text-primary-600 hx:data-[state=selected]:dark:border-primary-500 hx:data-[state=selected]:dark:text-primary-600 hx:mr-2 hx:rounded-t hx:p-2 hx:font-medium hx:leading-5 hx:transition-colors hx:-mb-0.5 hx:select-none hx:border-b-2 hx:border-transparent hx:text-gray-600 hx:hover:border-gray-200 hx:hover:text-black hx:dark:text-gray-200 hx:dark:hover:border-neutral-800 hx:dark:hover:text-white" role="tab" type="button" aria-controls="tabs-panel-{{ $globalID }}-{{ $item.id }}"{{- if eq $i $selectedIndex }} aria-selected="true" tabindex="0" data-state="selected"{{- end }}>
         {{- $item.name -}}
       </button>
     {{- end -}}
   </div>
 </div>
 <div>
-    {{- range $i, $item := $tabs -}}
-      <div
-        class="hextra-tabs-panel hx:rounded-sm hx:pt-6 hx:hidden hx:data-[state=selected]:block"
-        id="tabs-panel-{{ $globalID }}-{{ $item.id }}"
-        role="tabpanel"
-        {{- if eq $i $selectedIndex -}}
-        tabindex="0"
-        data-state="selected"
-        {{ end -}}
-      >
-        {{- $item.content  | markdownify -}}
-      </div>
-    {{- end -}}
+  {{- range $i, $item := $tabs -}}
+    <div class="hextra-tabs-panel hx:rounded-sm hx:pt-6 hx:hidden hx:data-[state=selected]:block" id="tabs-panel-{{ $globalID }}-{{ $item.id }}" role="tabpanel"{{- if eq $i $selectedIndex }} tabindex="0" data-state="selected"{{- end }}>
+      {{- $item.content | markdownify -}}
+    </div>
+  {{- end -}}
 </div>