Remove "Assignees" and "Authors" filters from issues page

Remove the "Assignees" and "Authors" filters from the issues page,
including the view code that fetches their data.

Especially the "Authors" filter was problematic, as it contained all 25k
users who ever wrote a bug report, including HTML to download and render
their avatar. This was basically a DOS on the browser.

See go-gitea#22549 for the upstream bug
report about this.

routers/web/repo/issue.go

@@ -297,18 +297,21 @@ func issues(ctx *context.Context, milestoneID, projectID int64, isPullOption uti
 	ctx.Data["CommitLastStatus"] = lastStatus
 	ctx.Data["CommitStatuses"] = commitStatuses
 
-	// Get assignees.
-	ctx.Data["Assignees"], err = repo_model.GetRepoAssignees(ctx, repo)
-	if err != nil {
-		ctx.ServerError("GetAssignees", err)
-		return
-	}
-
-	ctx.Data["Posters"], err = repo_model.GetIssuePosters(ctx, repo, isPullOption.IsTrue())
-	if err != nil {
-		ctx.ServerError("GetIssuePosters", err)
-		return
-	}
+	// Disabled by Sybren (2023-01-24) to speed up rendering of the issues page.
+	// See https://github.com/go-gitea/gitea/issues/22586 for more info.
+	//
+	// // Get assignees.
+	// ctx.Data["Assignees"], err = repo_model.GetRepoAssignees(ctx, repo)
+	// if err != nil {
+	// 	ctx.ServerError("GetAssignees", err)
+	// 	return
+	// }
+
+	// ctx.Data["Posters"], err = repo_model.GetIssuePosters(ctx, repo, isPullOption.IsTrue())
+	// if err != nil {
+	// 	ctx.ServerError("GetIssuePosters", err)
+	// 	return
+	// }
 
 	handleTeamMentions(ctx)
 	if ctx.Written() {

templates/repo/issue/list.tmpl

@@ -92,6 +92,9 @@
 							{{end}}
 						</div>
 					</div>
+					{{- /*
+					Disabled by Sybren (2023-01-24) to speed up rendering of the issues page.
+					See https://github.com/go-gitea/gitea/issues/22586 for more info.
 
 					<!-- Author -->
 					<div class="ui {{if not .Posters}}disabled{{end}} dropdown jump item">
@@ -132,6 +135,7 @@
 							{{end}}
 						</div>
 					</div>
+					*/ -}}
 
 					{{if .IsSigned}}
 						<!-- Type -->