fix: enter key causing focus loss in default editor title during composition input

[LIlGG]

What type of PR is this?

/kind bug
/area editor
/milestone 2.18.x

What this PR does / why we need it:

使用组合输入时，按下回车键不再执行编辑器获取焦点的事件。

Which issue(s) this PR fixes:

Fixes #6345

Does this PR introduce a user-facing change?

解决默认编辑器标题在使用组合输入时，按下回车键会导致其失去焦点的问题。

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 58.29%. Comparing base (bc10336) to head (48245e4).
Report is 80 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6347      +/-   ##
============================================
+ Coverage     54.51%   58.29%   +3.78%     
- Complexity     3523     3764     +241     
============================================
  Files           646      646              
  Lines         21862    21978     +116     
  Branches       1528     1545      +17     
============================================
+ Hits          11917    12813     +896     
+ Misses         9328     8546     -782     
- Partials        617      619       +2     

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[guqing]

/lgtm

[ruibaby]

/lgtm

[f2c-ci-robot]

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