@@ -200,6 +200,33 @@ describe('reading mode', () => {
         expect(muya.getMarkdown()).toContain('original');
     });
 
+    it.each(['muya', 'selection'] as const)('selects the whole reading document through %s without editing selection side effects', (entry) => {
+        const muya = boot('| a | b |\n| --- | --- |\n| c | d |\n\nLast paragraph', true);
+        const first = muya.editor.scrollPage!.firstContentInDescendant()!;
+        const last = muya.editor.scrollPage!.lastContentInDescendant()!;
+        const state = muya.getState();
+        const history = muya.getHistory();
+        const changed = vi.fn();
+        muya.on('selection-change', changed);
+        const setSelection = vi.spyOn(muya.editor.selection, 'setSelection');
+
+        if (entry === 'muya')
+            muya.selectAll();
+        else
+            muya.editor.selection.selectAll();
+
+        const range = document.getSelection()!.getRangeAt(0);
+        expect(range.startContainer).toBe(first.domNode);
+        expect(range.startOffset).toBe(0);
+        expect(range.endContainer).toBe(last.domNode);
+        expect(range.endOffset).toBe(last.domNode!.childNodes.length);
+        expect(muya.editor.selection.table.hasSelection).toBe(false);
+        expect(setSelection).not.toHaveBeenCalled();
+        expect(changed).not.toHaveBeenCalled();
+        expect(muya.getState()).toEqual(state);
+        expect(muya.getHistory()).toEqual(history);
+    });
+
     it('copies Markdown through the existing clipboard pipeline while reading', () => {
         const muya = boot('**hello** and [link](https://example.com)', true);
         muya.selectAll();
 
@@ -502,19 +502,6 @@ export class Muya {
     }
 
     selectAll() {
-        if (this.readOnly) {
-            const first = this.editor.scrollPage?.firstContentInDescendant()?.domNode;
-            const last = this.editor.scrollPage?.lastContentInDescendant()?.domNode;
-            if (!first || !last)
-                return;
-            const range = document.createRange();
-            range.setStart(first, 0);
-            range.setEnd(last, last.childNodes.length);
-            const selection = document.getSelection();
-            selection?.removeAllRanges();
-            selection?.addRange(range);
-            return;
-        }
         this.editor.selection.selectAll();
     }
 
 
@@ -168,6 +168,19 @@ class TextSelection {
         if (aBlock == null || fBlock == null)
             return;
 
+        if (this._muya.readOnly) {
+            const first = aBlock.domNode;
+            const last = fBlock.domNode;
+            if (!first || !last)
+                return;
+            // Reading selections must preserve folding and avoid editor selection side effects.
+            const range = this._doc.createRange();
+            range.setStart(first, 0);
+            range.setEnd(last, last.childNodes.length);
+            this._selectRange(range);
+            return;
+        }
+
         this.setSelection(
             { offset: 0, block: aBlock, path: aBlock.path },
             { offset: fBlock.text.length, block: fBlock, path: fBlock.path },
 
@@ -135,6 +135,11 @@ class Selection {
     }
 
     selectAll(): void {
+        if (this._muya.readOnly) {
+            this._text.selectAllContent();
+            return;
+        }
+
         const tableSelection = this._table;
 
         // A frozen rectangular table selection escalates: the whole table jumps