When I just tried this, it only selected them all after I had selected one. If I started with none selected, cmd-A didn't do anything.

When I just tried this, it only selected them all after I had selected one. If I started with none selected, cmd-A didn't do anything.

You first need to put focus on the simulation table. If you simply switch to the simulation tab, the simulation table is not focused (you can actually see the blue outline around the 'New simulation' button, so that button has focus).

How do I give it focus without selecting an existing sim? Clicking in the blank part of the list area doesn't do it.

Testing results, using A simple model rocket example. There are two behaviors, the first of which is expected, the second of which is not.

Action One (Expected Behavior)

1. Open the example and go straight to the Flight simulations tab.
2. Press Ctrl+A results in no selection; expected behavior.
3. Left-click on Simulation 1 (highlighting that simulation).
4. Press Ctrl+A results in selection of all simulations.

Action Two (Unexpected Behavior)

1. Open the example and go straight to the Flight simulations tab.
2. Left-click on Simulation 1 (highlighting that simulation), and left-click Run simulations to re-run that simulation (the simulation remains highlighted after being re-run and may be re-run any number of times without re-selecting the simulation).
3. Press Ctrl+A results in no selection; unexpected behavior, the expected bahavior would be to select all simulations.
4. Left-click on any simulation, including Simulation 1.
5. Press Ctrl+A results in selection of all simulations.

No other unexpected behaviors found.

Build 826
[Windows 11 Pro; Version 21H2; OS Build 22000.739; Windows Feature Experience Pack 1000.22000.739.0]
[Java "11.0.15" 2022-04-19 LTS; Java(TM) SE Runtime Environment 18.9 (build 11.0.15+8-LTS-149)]

How do I give it focus without selecting an existing sim? Clicking in the blank part of the list area doesn't do it.

You can't, you can only do so by selecting a sim (the same is true for the motors, recovery and stage configuration table).

Action Two (Unexpected Behavior)

1. Open the example and go straight to the Flight simulations tab.
2. Left-click on Simulation 1 (highlighting that simulation), and left-click Run simulations to re-run that simulation (the simulation remains highlighted after being re-run and may be re-run any number of times without re-selecting the simulation).
3. Press Ctrl+A results in no selection; unexpected behavior, the expected bahavior would be to select all simulations.
4. Left-click on any simulation, including Simulation 1.
5. Press Ctrl+A results in selection of all simulations.

Hm well this issue isn't really inherent to the implementation of this PR... The same behavior holds in the motors, recovery and stage config tables. E.g. the motors config: select a config, hit ctrl + A, selects all configs, select an individual config again and click 'reset deployment', and then hit ctrl + A again, nothing happens.

On macOS you can also see that Java Swing make a visual distinction between a row being selected and in focus and a row being selected, but not in focus (because the focus was lost after clicking 'reset deployment'). See video below.

So I would create a new issue to restore the focus to the motors, recovery, stage and simulation table after a certain action has been performed. That will fix the issue you described.

As described by @SiboVG above, this PR functions as expected with no anomalies found.

Build 826
[Windows 11 Pro; Version 21H2; OS Build 22000.739; Windows Feature Experience Pack 1000.22000.739.0]
[Java "11.0.15" 2022-04-19 LTS; Java(TM) SE Runtime Environment 18.9 (build 11.0.15+8-LTS-149)]

On macOS you can also see that Java Swing make a visual distinction between a row being selected and in focus and a row being selected, but not in focus

That is hilariously subtle.