Shrink ignores what cannot be seen; blank lines at a block's end go

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

client/js/session.js

@@ -17,6 +17,7 @@ import {
   MAX_PAGE_HIDES,
 } from './page_model.js';
 import { RelayConnection } from './relay_connection.js';
+import { trimTrailingBlankLines } from './text_layout.js';
 
 /** @typedef {import('./crypto.js').Identity} Identity */
 /** @typedef {import('./page_model.js').Layer} Layer */
@@ -525,6 +526,15 @@ export class Session {
   shrinkPage() {
     const page = this.page;
     if (!this.mayMakePages() || page.number === 0) return false;
+    // The blank lines at the end of one's own text blocks go first (Andy,
+    // 2026-10-14); another's blocks are theirs, trimmed when they finish
+    // typing.  Each trim is a gesture of its own to undo; a block being
+    // typed in is left to the editor.
+    for (const block of this.ownLayer.texts.values()) {
+      if (!this.beginTextEdit(block.id, 'shrink')) continue;
+      if (trimTrailingBlankLines(block)) this.setText(block);
+      this.endTextEdit(block.id, 'shrink');
+    }
     const sheet = page.contentSheet();
     if (!sheet || (sheet.left === page.baseLeft && sheet.top === page.baseTop &&
                    sheet.width === page.baseWidth && sheet.height === page.baseHeight)) return false;