Choice of number of data points plotted

[trueb2]

Describe the request

Allow the number of data points displayed by the plotter to be configured.

Describe the current behavior

Serial Plotter displays only 50 data values, compared to the Arduino IDE 1.x plotter, which displayed 500 values.

This is a problem because events stream by 10 times faster and are much harder to see. With 500 points we see a much clearer time history of the physical measurements we're making.

arduino-serial-plotter-webapp version

22c6952

Additional context

Additional requests

• Allow display of more data points in Serial Plotter arduino-ide#803

Issue checklist

• I searched for previous requests in the issue tracker
• I verified the feature was still missing when using the latest version
• My request contains all necessary details