[Accessibility] ToolStripTextBox must support Text pattern

[vladimir-krestov]

• Original Bug: 1155254

• .NET Core Version: 5.0.0-rc.1.20431.5

• Have you experienced this same bug with .NET Framework?: Yes

Problem description:

• ToolStripTextBox doesn't support Text pattern
• A ScreenReader can't announce separate navigated, selected, or added characters in ToolStripTextBox

Expected behavior:

• ToolStripTextBox must support Text pattern (may be checked using Inspect)
• A ScreenReader announces separate navigated, selected, or added characters in ToolStripTextBox

Minimal repro:

• Create a .Net 5.0 app
• Add a ToolStrip with a ToolStripTextBox item
• Run the app and check ToolStripTextBox using Inspect or Narrator

[merriemcgaw]

@vladimir-krestov can this be closed now?