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Plot Panel Y-limit bugs

See original GitHub issue

Description There are a few bugs in the Y-limits settings for Plot panels. I grouped them altogether in this issue but am happy to separate them if that would be better.

Version: 1.12.0
OS: Ubuntu 20.04
Data source (e.g. bag file, mcap file, rosbridge, ROS 1/2 native): Seems to be data source agnostic - I am able to replicate the issues even when not connected to a data source. For my example below I used a ROS 1 live connection.
ROS distro (if applicable): Noetic

Steps To Reproduce and Expected Behavior

Create a new layout and add a Plot panel
Plot something
Open the panel settings and look at Y-min and Y-max.

Auto-scale

Expected result: I would’ve expected the defaults to be auto and auto, with the plot auto-scaling. Actual result: The plot is auto-scaling as expected, but the Y-min and Y-max are reading back 0 and 0 instead of auto and auto. This is confusing, especially because if you backspace the 0s they will turn to auto. Workaround: The only way to set an actual limit of 0 is to backspace the 0 and retype it in.

Negative values

Now, in the Y-min box, backspace the 0 and attempt to type -10.

Expected result: As I type -10, it appears in the textbox, and the minimum on the plot goes to -10. Actual result: A - is not allowed in the textbox when the textbox is empty. Workaround: Type 10, and then move the cursor to the front to type the -. It seems to accept the - as long as the textbox already has other text in it and isn’t empty.

Reversed values

Attempt to set the Y-min to 10 and the Y-max to -10 (using the above workaround to type the -). I’ve accidentally done this many times, reversing the Y-min and the Y-max (I think my brain wants to have the Y-max on the top because its setting the value for the top of the graph).

Expected result: Studio throws an error at me, because my Y-max is less than my Y-min. Or even better, Studio figures out that i just reversed them and plots [10, 10]. Actual result: Foxglove does figure out that I reversed them and plots [-10, 10], which is really helpful. However, for some reason it removes all the horizontal lines on my plot 😕 Workaround: Don’t mix up the Y-min and Y-max 😃 Now that I know what is going on its easy to workaround, but for awhile I wasn’t sure why all my horizontal lines were going away.