Michał Krassowski

Enable creating widgets in shadow DOM

6

Fixes #434. Introduces a distinction between `attachmentNode` and a content `node`. Adds new methods: - `adoptStyleSheet()` - `removeAdoptedStyleSheet()`

DataGrid is slow when cells contain a lot of (long) text

13

## Description Rendering, and scrolling within DataGrid is very lagy when large text is present in cells. This is due to `CanvasRenderingContext2D.measureText` invocations. - Firefox: 8.5 seconds - Chrome: 11.5...

### Problem I would like to scroll horizontally with shift + mouse wheel. ### Proposed Solution Detect if shift is pressed in [`onWheel` handler](https://github.com/jupyterlab/lumino/blob/15fb5d14136b9d465d744c3373bd347fe1f40bf0/packages/datagrid/src/basicmousehandler.ts#L656) and swap `dx` with `dy` if...

Performance for consecutive tab switching improvements

2

### Problem Some actions in the UI are expensive. When user navigates open tabs they may want to switch a few tabs ahead using a keyboard shortcut. Even with relatively...

Zoom with CTRL+= (equals) no longer works

6

The browsers and editors I know that support zoom out with ctrl + - and zoom in with ctrl + + also support ctrl + = for zoom in. Electron...

## Description Environment variables from CLI are only passed for the first instance launched. Depending on what CLI command you use first you will get different env variables in both...

I wonder if a restart button would be useful for this use-case [of restarting after installing extensions]. What I've been doing is opening the environment selection list and clicking enter...

Reviewing #567, I noticed that the dialog includes the full token:  If the token helps in session identification it would be probably sufficient to only show a part of...

The splash animation (`jupyterlab-splash`) should probably be enabled for theme UI changes.

Switching tabs with large notebooks in JupyterLab can be slow. In JupyterLab 3.6 we added opt-in `contentVisibility` `hiddenMode` which gives a significant boost on Chromium browsers (but is not well...