Fix various problems (#37077)

Quick fix for 1.26.

* Slightly refactor NewComment to fix incorrect responses, remove
incorrect defer (still far from ideal)
* Avoid `const` causes js error in global scope
* Don't process markup contents on user's home activity feed, to avoid
js error due to broken math/mermaid code

* Fix #36582

---------

Signed-off-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: silverwind <me@silverwind.io>

templates/repo/issue/view_content/pull_merge_box.tmpl

@@ -221,6 +221,7 @@
 						{{end}}
 						<div class="divider"></div>
 						<script type="module">
+						(() => {
 							const defaultMergeTitle = {{.DefaultMergeMessage}};
 							const defaultSquashMergeTitle = {{.DefaultSquashMergeMessage}};
 							const defaultMergeMessage = {{.DefaultMergeBody}};
@@ -299,6 +300,7 @@
 								}
 							];
 							window.config.pageData.pullRequestMergeForm = mergeForm;
+						})();
 						</script>
 
 						{{$showGeneralMergeForm = true}}

templates/user/dashboard/feeds.tmpl

@@ -110,7 +110,7 @@
 					<a href="{{.GetCommentLink ctx}}" class="tw-inline-block tw-truncate issue title">{{(.GetIssueTitle ctx) | ctx.RenderUtils.RenderIssueSimpleTitle}}</a>
 					{{$comment := index .GetIssueInfos 1}}
 					{{if $comment}}
-						<div class="render-content markup tw-text-14">{{ctx.RenderUtils.MarkdownToHtml $comment}}</div>
+						<div class="render-content markup truncated-markup">{{ctx.RenderUtils.MarkdownToHtml $comment}}</div>
 					{{end}}
 				{{else if .GetOpType.InActions "merge_pull_request"}}
 					<div class="flex-item-body tw-text-text">{{index .GetIssueInfos 1 | ctx.RenderUtils.RenderIssueSimpleTitle}}</div>