Creating multiple selections in Live Preview sets incorrect selection boundaries

Developers: Plugin & API
1

When setting multiple selections via the Obsidian API, the selection boundaries don’t work as expected for characters that are hidden by Live Preview.

Steps to reproduce

  1. Create a document with some content that would be hidden by Live Preview (e.g. headings or checkboxes):
    ### Test 1
### Test 2
### Test 3
  2. Create a new plugin and register a command with a new editorCallback. Inside the callback, programmatically select all occurrences of ### via editor.setSelections. For instance:
    editor.setSelections([
  {
    anchor: {
      line: 0,
      ch: 0,
    },
    head: {
      line: 0,
      ch: 3,
    },
  },
  {
    anchor: {
      line: 1,
      ch: 0,
    },
    head: {
      line: 1,
      ch: 3,
    },
  },
  {
    anchor: {
      line: 2,
      ch: 0,
    },
    head: {
      line: 2,
      ch: 3,
    },
  },
]);
  3. Ensure ‘Source mode’ is disabled. Run the command from step 2.

Expected result

All occurrences have the correct selection boundaries (in the above example, characters 0-3 on each line).

Actual result

Only the first occurrence is fully selected; the other lines only get a cursor at the beginning.

Environment

  • Operating system: macOS
  • Debug info:
    Obsidian version: v1.1.9
Installer version: v1.1.9
Operating system: Darwin Kernel Version 21.6.0: Mon Aug 22 20:17:10 PDT 2022; root:xnu-8020.140.49~2/RELEASE_X86_64 21.6.0
Login status: logged in
Catalyst license: none
Insider build toggle: off
Live preview: on
Legacy editor: off
Base theme: dark
Community theme: none
Snippets enabled: 0
Restricted mode: off
Plugins installed: 6
Plugins enabled: 1
    1: Plugin Testing Sandbox v1.0.0

Additional information

You can use this file to reproduce: obsidian-plugin-sandbox/main.ts at live-preview-multi-select · timhor/obsidian-plugin-sandbox · GitHub

The multi-selection works fine when Source mode is on.

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