[tablepagination] Add focus style to default InputBase used in Select

[silviuaavram]

• I have followed (at least) the PR section of the contributing guide.

The control is focusable, so the focus style should be clearly visible. Since it's used in DataTable / TablePagination, it's high impact. Not changing anything related to InputBase or Select, since their focus style is expected.

Before	After

[Copilot]

Pull request overview

Reintroduces a visible focus treatment for the native <select> element used by NativeSelect (and consumers like TablePagination), addressing a regression where focus state became difficult to perceive.

Changes:

• Adds a focus-state background color to StyledSelectSelect in NativeSelectInput.

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Bundle size

Bundle	Parsed size	Gzip size
@mui/material	🔺+104B(+0.02%)	🔺+22B(+0.01%)
@mui/lab	0B(0.00%)	0B(0.00%)
@mui/private-theming	0B(0.00%)	0B(0.00%)
@mui/system	0B(0.00%)	0B(0.00%)
@mui/utils	0B(0.00%)	0B(0.00%)

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[Copilot]

Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated no new comments.

Comments suppressed due to low confidence (1)

packages/mui-material/src/NativeSelect/NativeSelectInput.js:42

• The newly added &:focus background color isn’t covered by any existing tests for NativeSelectInput, so it could regress again without being caught. Consider adding a browser-only unit test (e.g. it.skipIf(isJsdom())) that focuses the rendered <select> and asserts the computed background-color matches theme.palette.action.focus (or theme.vars.palette.action.focus when using CSS vars).

  '&:focus': {
    backgroundColor: (theme.vars || theme).palette.action.focus,
    // Reset Chrome style
    borderRadius: 0,
  },

[ZeeshanTamboli]

@silviuaavram In the PR title and description you mention InputBase. Is it input or select component?

[silviuaavram]

@silviuaavram In the PR title and description you mention InputBase. Is it input or select component?

corrected 👍🏽

[silviuaavram]

Give me a second, I need to further test this one out.