Fixes#3931
- Align run button correctly so it's centered in new cell
- Refactor to support multi-state button.
- Hidden state is set to show execution count
- Stopped state shows run button
- Running state shows stop button
- Error state (will) show error button. This isn't fully handled right now
- Add execution count to model and to SqlKernel, verify serialization, loading, update matches other notebook viewers
**Notes on implementation**:
I think this is a decent solution for a) showing execution count as text, and b) perfectly centering the run button.
The below solution shows count correctly up to 999 runs (that’s clicking 999 times in a single session), the icon lines up juuust about right with [ ] but for other numbers it is pretty close but probably not exactly right. I wish I could solve this to work better but trying to change text float to center etc. really isn’t working.
**Screenshots**:

With running cell:

- Added `runCell` API. Updated runCell button to listen to events on the model so it'll reflect run cell when called from other sources
- Plumbed through kernelspec info to the extension side so when changed, it's updated
- Fixed bug in ConnectionProfile where it didn't copy from options but instead overrode with empty wrapper functions
Here's the rough test code (it's in the sql-vnext extension and will be out in a separate PR)
```ts
it('Should connect to local notebook server with result 2', async function() {
this.timeout(60000);
let pythonNotebook = Object.assign({}, expectedNotebookContent, { metadata: { kernelspec: { name: "python3", display_name: "Python 3" }}});
let uri = writeNotebookToFile(pythonNotebook);
await ensureJupyterInstalled();
let notebook = await sqlops.nb.showNotebookDocument(uri);
should(notebook.document.cells).have.length(1);
let ran = await notebook.runCell(notebook.document.cells[0]);
should(ran).be.true('Notebook runCell failed');
let cellOutputs = notebook.document.cells[0].contents.outputs;
should(cellOutputs).have.length(1);
let result = (<sqlops.nb.IExecuteResult>cellOutputs[0]).data['text/plain'];
should(result).equal('2');
try {
// TODO support closing the editor. Right now this prompts and there's no override for this. Need to fix in core
// Close the editor using the recommended vscode API
//await vscode.commands.executeCommand('workbench.action.closeActiveEditor');
}
catch (e) {}
});
it('Should connect to remote spark server with result 2', async function() {
this.timeout(240000);
let uri = writeNotebookToFile(expectedNotebookContent);
await ensureJupyterInstalled();
// Given a connection to a server exists
let connectionId = await connectToSparkIntegrationServer();
// When I open a Spark notebook and run the cell
let notebook = await sqlops.nb.showNotebookDocument(uri, {
connectionId: connectionId
});
should(notebook.document.cells).have.length(1);
let ran = await notebook.runCell(notebook.document.cells[0]);
should(ran).be.true('Notebook runCell failed');
// Then I expect to get the output result of 1+1, executed remotely against the Spark endpoint
let cellOutputs = notebook.document.cells[0].contents.outputs;
should(cellOutputs).have.length(4);
let sparkResult = (<sqlops.nb.IStreamResult>cellOutputs[3]).text;
should(sparkResult).equal('2');
try {
// TODO support closing the editor. Right now this prompts and there's no override for this. Need to fix in core
// Close the editor using the recommended vscode API
//await vscode.commands.executeCommand('workbench.action.closeActiveEditor');
}
catch (e) {}
});
});
```
* Hide ToggleMoreAction for inactive cell
* Revert wrong merge
* Undo bad merge
* Enable markdown to hide ToggleMoreAction
* Resolve PR comments
* Fixed the name
* Change name
* Fix toggleMoreActions by passing in CellContext instead of just nb model
* Fixed the warning by removing notificationService from the caller
Full plumb through of Session support. Also fixed some test issues
- Load session and get necessary information in kernels list
- Run Cell button now works as expected
- Added a ToggleAction base class which can be used for anything that switches icons. I'd still prefer to have this be dynamic and as clean as the extension classes
- Fixed account test unhandled promise rejections (caused by incorrect / invalid tests) that made it hard to see all the test run output.
* Added toggle more actions to cell
* Resolve PR comments
-- Added INotificationService for notification msg
* Reduced ToggleMoreAction to smaller size. So the dropdown could be displayed closer to it instead of at the buttom of the cell.
* Initial toolbar work
- This is in-progress and needs additional fixes
* Resolve PR comments
* Added empty kernel and hook up with Kernel dropdown
* Resolve PR comments