Closes#21262
Introduces a new setting `keep_selection_on_copy`, which controls
whether the current text selection is preserved after copying in the
terminal. The default behavior remains the same (`true`), but setting it
to `false` will clear the selection after the copy operation, matching
VSCode's behavior.
Additionally, the terminal context now exposes a `selection` flag
whenever text is selected.
This allows users to match VSCode and other terminal's smart copy
behavior.
Release Notes:
- Expose `selection` to terminal context when there is text selected in
the terminal
- Add `keep_selection_on_copy` terminal setting. Can be set to false to
clear the text selection when copying text.
**VSCode Behavior Example:**
**settings.json:**
```json
"terminal": {
"keep_selection_on_copy": false
},
```
**keymap.json:**
```json
{
"context": "Terminal && selection",
"bindings": {
"ctrl-c": "terminal::Copy"
}
}
```
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