Action Release trigger

[alygin]

Some handy code and workspace navigation features in other editors use shortcuts that are handled when keys are pressed and when they are released.

For instance, first ctrl+tab opens the tab switcher and automatically selects the previously opened tab, all the consecutive ctrl+tabs iterate selection through the list items, and when the ctrl key is released, we open the currently selected tab.

Recently, there were several disussions and requests for such behaviour:

• cmd-p should move to next entry when in file finder #4450 (comment)
• CMD-P auto trigger #8258
• Add tab switcher #7987 (comment)

At the moment, GPUI doesn't provide API for implementing such navigation features.

My idea is to add on_action_release() / capture_action_release() to the GPUI elements in addition to on_action() / capture_action() that would trigger when all modifier keys are released right after an action has been performed.

Here's a PoC implementation: Support for action release events that allowed me to easily make this Tab Switcher work the same way as in VSCode: it's opened with ctrl+tab, navigated with ctrl still pressed and tabs hitted, and finally switches to the selected tab when ctrl is released:

zed-action-release.mov

What do you think of such feature, of the proposed API and the way it's implemented?

[Moshyfawn]

I'm going to turn this into an issue, as there are several items being actively worked on.