9f8d33c8b2b6bc61f6d02d781c4e02836f7099f9
max
  Fri Aug 21 02:05:42 2026 -0700
hgSession: new opt-in JavaScript "My Sessions" page; share gbModern.css with hgBlat. refs #38157

Applies the hgBlat facelift strategy (#37996) to hgSession: an opt-in,
client-rendered "My Sessions" page gated by the sessionNewPage /
sessionNewPageBanner hg.conf flags (mirroring blatNewForm / blatNewFormBanner),
with a banner linking between the classic and new pages so neither is a one-way
door. sessionNewPage also flips the site default.

hgSession.c stays the data/action backend: it emits the session list and page
config as an inline JSON global (hgSessionData) into an empty #sessionApp
container, and the new hgSession.js builds the UI - a save-current-view card
(name + optional description + "only I can load it"; empty name saves under a
random share_ name), a "most recently saved session" one-click Update, a
searchable/sortable/paged DataTable of sessions (assembly + position, created
with last-used on hover, views, a lock icon on private sessions), inline Share
(copy link / email / gallery), Edit (rename + description + private), Overwrite
and Delete, and a bulk Select -> Delete-all-selected mode.  The mutating actions
POST to new JSON endpoints (hgS_doDeleteJson / doShareJson / doGalleryJson /
doOverwriteJson / doDescribeJson) that run the same SQL as the classic full-page
handlers and return JSON, so the table updates in place; loads, file up/downloads
and custom-track backup stay as ordinary form submits/links.  The Advanced panel
keeps feature parity with the classic page (load another user's session, load
from URL/file, save to file, back up custom tracks, reset), minus the login/
change-password links that now live in the top menu.

Shared UCSC house-style components (design tokens, .gbPill, .gbCard, .gbStrip,
.gbSection, .gbShareBox, .gbBanner, the .gbModal* dialog and a .gbTable) are
factored into a new gbModern.css.  hgBlat is migrated onto it: its generic
.blat* classes are renamed to the shared .gb* names in hgBlat.css / hgBlat.js
and the #blatResults / #blatFormBox containers get class="gbApp"; verified
pixel-clean against the previous search form and results pages, including the
rename modal.  hgSession.css holds only session-specific layout.

diff --git src/hg/hgSession/hgSession.h src/hg/hgSession/hgSession.h
index f46c0336c92..a747b22f115 100644
--- src/hg/hgSession/hgSession.h
+++ src/hg/hgSession/hgSession.h
@@ -16,30 +16,39 @@
 extern char *database;		/* Current database, often but not always dbDatabase. */
 
 /* hgSession form inputs */
 #define hgsNewSessionName hgSessionPrefix "newSessionName"
 #define hgsNewSessionShare hgSessionPrefix "newSessionShare"
 #define hgsNewSessionDescription hgSessionPrefix "newSessionDescription"
 #define hgsDoNewSession hgSessionPrefix "doNewSession"
 
 // AJAX endpoint behind the "Share a link" menu button (see topLinks.js).  hgsShareAnon (when
 // set, or when no user is logged in) saves under the reserved anonymous user "l".
 #define hgsDoSaveSessionJson hgSessionPrefix "doSaveSessionJson"
 #define hgsShareAnon hgSessionPrefix "shareAnon"
 // Rename an existing session (hgsOldSessionName -> hgsNewSessionName) for the "Specify name" step.
 #define hgsDoRenameSessionJson hgSessionPrefix "doRenameSessionJson"
 
+// AJAX endpoints for the experimental client-rendered Sessions page (hgSession.js).  Each acts on
+// the session named by hgsOldSessionName (decoded) under the current user and returns JSON instead
+// of re-rendering the whole page.  All are covered by the hgsDo prefix in cleanHgSessionFromCart.
+#define hgsDoDeleteJson hgSessionPrefix "doDeleteJson"
+#define hgsDoShareJson hgSessionPrefix "doShareJson"
+#define hgsDoGalleryJson hgSessionPrefix "doGalleryJson"
+#define hgsDoOverwriteJson hgSessionPrefix "doOverwriteJson"
+#define hgsDoDescribeJson hgSessionPrefix "doDescribeJson"
+
 #define hgsSharePrefix hgSessionPrefix "share_"
 #define hgsGalleryPrefix hgSessionPrefix "gallery_"
 #define hgsEditPrefix hgSessionPrefix "edit_"
 #define hgsLoadPrefix hgSessionPrefix "load_"
 #define hgsDeletePrefix hgSessionPrefix "delete_"
 
 #define hgsShowDownloadPrefix hgSessionPrefix "showDownload_"
 #define hgsMakeDownloadPrefix hgSessionPrefix "makeDownload_"
 #define hgsDoDownloadPrefix hgSessionPrefix "doDownload_"
 
 #define hgsSaveLocalBackupFileName hgSessionPrefix "saveLocalBackupFileName"
 #define hgsSaveLocalFileName hgSessionPrefix "saveLocalFileName"
 #define hgsSaveLocalFileCompress hgSessionPrefix "saveLocalFileCompress"
 #define hgsDoSaveLocal hgSessionPrefix "doSaveLocal"