[Bug report]: In `fullScreen` mode, switching themes will restore size

[RSS1102]

Describe the bug

1. click fullScreen
2. switch Theme

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Using the second instance.

Reproduction

https://tencent.github.io/cherry-markdown/examples/multiple.html

System Info

System:
    OS: Windows 10 10.0.22621
    CPU: (16) x64 AMD Ryzen 7 5825U with Radeon Graphics
    Memory: 6.58 GB / 19.86 GB
  Binaries:
    Node: 18.6.0 - C:\Program Files\nodejs\node.EXE
    Yarn: 1.22.10 - C:\Program Files\nodejs\yarn.CMD
    npm: 8.13.2 - C:\Program Files\nodejs\npm.CMD
    pnpm: 8.6.10 - C:\Program Files\nodejs\pnpm.CMD
  Browsers:
    Edge: Spartan (44.22621.2283.0), Chromium (117.0.2045.47)
    Internet Explorer: 11.0.22621.1

Validations

• [X] Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• [X] Check that this is a concrete bug. For Q&A, please open a GitHub Discussion instead.
• [X] The provided reproduction is a minimal reproducible of the bug.

Help us

Yes, I would like to try submitting a PR for this issue.