Block on scale changes mass when clicked

[KatieWoe]

Test device Samsung Operating System Win 11 Browser Chrome Problem description For https://github.com/phetsims/qa/issues/930. Also seen in published. When a block is sitting on the scale and you click it to pick it up, the mass read may change. It may change only .01 kg or it may change .3 kg or more. It tends to get "heavier." The amount is fairly consistent for each block, and this was mound with a mouse, so I don't think it is me accidentally moving the block. @Nancy-Salpepi also saw this, so it doesn't seem to be dependent on device.

Visuals

https://user-images.githubusercontent.com/41024075/234670216-ad469538-cebe-40e4-9c4e-76228ba1da7a.mp4

Troubleshooting information:

!!!!! DO NOT EDIT !!!!! Name: ‪Density‬ URL: https://phet-dev.colorado.edu/html/density/1.1.0-dev.3/phet/density_all_phet.html Version: 1.1.0-dev.3 2023-04-19 18:32:51 UTC Features missing: touch Flags: pixelRatioScaling User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/112.0 Language: en-US Window: 1536x731 Pixel Ratio: 1.25/1 WebGL: WebGL 1.0 GLSL: WebGL GLSL ES 1.0 Vendor: Mozilla (ANGLE (Intel, Intel(R) HD Graphics Direct3D11 vs_5_0 ps_5_0)) Vertex: attribs: 16 varying: 30 uniform: 4096 Texture: size: 16384 imageUnits: 16 (vertex: 16, combined: 32) Max viewport: 32767x32767 OES_texture_float: true Dependencies JSON: {}

[arouinfar]

Thanks @KatieWoe.

It seems like the block is moving ever-so-slightly when grabbed which is causing the mass display to change. I think the behavior is acceptable, but I think it would be good for @jonathanolson to confirm things are working as expected.

[jonathanolson]

This seems like an unfortunate side-effect of how we handle mouse/touch interaction. So expected, and I don't see an easy way to work around it (but it may be possible).

[arouinfar]

Thanks @jonathanolson. Good to know this is the expected behavior, no workaround is necessary. Let's close.