"Start Debugging" toolbar button doesn't work

[Vdubro]

Bug Description:

Debug sessions cannot be started using "Debug: Start Debugging" from the toolbar. This is an issue I first noticed when moving from Theia 1.58.4 to Theia 1.64.1.

Steps to Reproduce:

1. In the command palette, select "Toolbar: Add Command to Toolbar".
2. Select the command "Debug: Start Debugging".
3. Assign some icon to the command and chose a column for it to be placed in.
4. With some launch configuration defined, click on that icon in the toolbar.
5. Nothing notable will happen, contrary to expectation.

Additional Information

My understanding of the root cause is as follows:

In Theia 1.58.4, after having assigned the command "Debug: Start Debugging" to a toolbar button, the onCLick handler for that button would eventually result in a call to DebugFrontendApplicationContribution.start with no debugSessionOptions argument. This would result in DebugSessionManager.start being called with options set to this.configurations.current at the end of the start method.

Now, due to the fact that we pass in a widget here, the debugSesionOptions argument ends up being a ToolbarImpl, and this gets passed to DebugSessionManager.start. Because a ToolbarImpl has no configuration property, DebugSessionManager.startCompound is wrongly called. Finally, since a ToolbarImpl has no property compound, an error is thrown here.

• Operating System: Windows 11
• Theia Version: 1.64.1

[msujew]

Hey @Vdubro,

Looks like you already started looking into this. Are you interested in contributing a fix?