fix: Only hide WidgetDiv if it is associated with the affected workspace.

[johnnesky]

The basics

• I validated my changes

The details

Resolves

Fixes RaspberryPiFoundation/blockly-samples#2131

Proposed Changes

This associates a workspace with the current WidgetDiv, so that when a workspace needs to clean up its chaff, it can detect whether the current WidgetDiv is associated with it and only clean it up if it's affected.

I added a workspace parameter to WidgetDiv.show() and ContextMenu.show(), and a hideIfOwnerIsInWorkspace method to WorkspaceDiv. I also updated some calls from WidgetDiv.hide() to WidgetDiv.hideIfOwner(this).

Reason for Changes

In RaspberryPiFoundation/blockly-samples#2131 the minimap plugin calls this.minimapWorkspace.zoomToFit() in response to changes, which calls WorkspaceSvg.hideChaff() which calls the static class method WidgetDiv.hide() which unfocuses inputs in the main workspace because the input widget is shared between the main workspace and the minimap workspace. Intermediate change events do not trigger the issue, so most text input fields work fine, but standard BlockChange events trigger the issue and editing procedure names and parameters will update caller blocks in the same workspace which fires BlockChange events which will trigger the issue and immediately unfocus the input field after typing a single character.

Test Coverage

I manually tested with the minimap plugin to make sure that procedures and procedure parameters could be renamed without immediately losing focus (and that basic widget hiding still seems to work). All existing unit tests pass.

Documentation

N/A

[NeilFraser]

Looks ok to both me and Christopher. Up to you whether you want to merge it now, or wait until after V11.