`cancelSelection` interferes with extension API `registerCommand("type")`

Does this issue occur when all extensions are disabled?: No, it's a bug with the extension API itself

- VS Code Version: 1.135.0-insider (Universal)
- OS Version: Darwin arm64 25.4.0

Hello, I'm reporting a bug I've noticed where calling `cancelSelection` interferes with extensions that register the `"type"` command. Normally extensions can register `"type"` to intercept all inputs:

```
subscription = vscode.commands.registerCommand("type", onType)
```

This is useful for Vim-style extensions which want to override regular typed letters like "a", "b", "c". Typing those letters are instead intercepted by the `onType` listener, and don't actually type letters.

However, I noticed that when I trigger a `"cancelSelection"` command, the next typed letter will actually get typed, somehow bypassing the `"type"` register command:

https://github.com/user-attachments/assets/b48758c2-b450-4fd1-9acd-7e2bcd05337e

In the above recording I have a `"type"` command registered, configured so that typing the letter "a" will trigger the `"cancelSelection"` command, and typing the letter "j" will trigger the `"cursorDown"` command.

When I press "j" I would expect the cursor to move down one row.

Instead, when I press "j" it removes most of the section I had previously highlighted, only keeping a couple letters. Then it adds "jj".

Some extra information:
* This issue began occurring sometime between 2026-01-01 and 2026-04-23 on stable
* My extension I used to reproduce this (`bmalehorn.vimspired`) hasn't been updated in 3 years, so it's not a change in the extension. You can view the extension source [here](https://github.com/bmalehorn/vscode-vimspired/blob/578eeb3b80979ac87d33799b8485475503f910b4/src/extension.ts)
* It's possible this is a regression in the extension API, and I'd be fine with a workaround my extension can use
* Canceling selection by pressing Escape does not reproduce the issue (so, what's the difference between Escape and `cancelSelection`?)
* This doesn't occur on reverse selection (selecting from right to left)
* This doesn't occur on multiline selections
* The amount of text remaining (above, only 1 character remained) is not consistently 1 character, it's a variable amount between 0 and the whole line
* Different keys (a, j) and different commands (cursorDown) still reproduce the issue

Steps to Reproduce:

1. Install the extension `bmalehorn.vimspired`
2. Set your vscode config to:
```json
{
"vimspired.keybindings": {
"a": "cancelSelection",
"j": "cursorDown",
},
}
```
3. in a file, highlight one line from left to right
4. press "a"
5. press "j"

Expected: the cursor moves down 1 row, no text is modified.
Actual: the previously-highlighted portion is partially deleted and "jj" is added to the end.