[Bug] Typing with backward (RTL) selection fails when editContext: false

[lindsbot]

Reproducible in vscode.dev or in VS Code Desktop?

• Not reproducible in vscode.dev or VS Code Desktop

Reproducible in the monaco editor playground?

• Not reproducible in the monaco editor playground

Monaco Editor Playground Link

https://microsoft.github.io/monaco-editor/playground.html?source=v0.55.1#XQAAAAJyAQAAAAAAAABBqQkHQ5NjdMjwa-jY7SIQ9S7DNlzs5W-mwj0fe1ZCDRFc9ws9XQE0SJE1jc2VKxhaLFIw9vEWSxW3yscwzfLcO_1uhs0-3YGTBOsVJ4S4FwfCDQb5-2uUHXTVAefbVSd9IzaZ_vv9VR9KugsKimARHSWlrTPOQHROITHxmAetfeRrm3VHdSe7_Etv6WpgzlH4vE8EOEDMNvLzPHayHVIURO2M6qOjjOCBmDnp9jHpzW-FcCFVbyRo9s1yu9JcALg0-q4mS26nJaSDhuVeFsYGKO0Io6JDuxXgCYOTLCbhVeWicHHKc38WIrk2e5pQg4dDatl-PvOuuXTMg3Zd8-S0Rnc_6N7EkhE4UW13jxSA6H8c1HzrreiAjNnK1_BnKLlTHPFla17_8NmDyg

Monaco Editor Playground Code

const value = /* set from `myEditor.getModel()`: */ `function hello() {
	alert('Hello world!');
}`;

const myEditor = monaco.editor.create(document.getElementById("container"), {
	value,
	language: "javascript",
	automaticLayout: true,
	editContext: false // this causes the bug
});

Reproduction Steps

1. Set editContext: false in editor config
2. Select text in editor from right to left
3. Type a single character to replace the selected text
4. Observe: the character does not replace the text

Actual (Problematic) Behavior

RTL selections are not immediately replaced by a valid character, the first keypress is ignored.

Expected Behavior

The text replacement should occur immediately, after the first keypress, regardless of the selection direction.

Additional Context

editContext: false is a necessary workaround for #5081. Users who need that fix now hit this RTL bug.

Workaround

Intercept keydown and use editor.trigger() for RTL selections