Resizing fixed-width columns within scrollable pane causes columns to disappear

[mgoetz-nerdery]

Describe the bug
If your table is wide enough to require horizontal scrolling, and you have specified width numbers for columns, you can get into situations where columns disappear entirely after auto-resizing a column.

To Reproduce
Steps to reproduce the behavior:

1. Set up a table that is wide enough to require horizontal scrolling, and has the width property specified on some columns (Reduced test case: https://codesandbox.io/p/sandbox/recursing-pasteur-dzyc2z)
2. Shrink three or more consecutive columns down to their minimum size using the table header drag handles
3. Double-click one of the shrunk columns to reset its size to initial
4. Notice that two of the shrunk columns have disappeared

Expected behavior
A minimum width should be retained so that columns do not disappear entirely.

Screenshots
If applicable, add screenshots to help explain your problem.
https://github.com/user-attachments/assets/4dbfc122-a8a5-40bb-8bde-22fa74ee926e

Desktop (please complete the following information):

• OS: Mac OS 26.3.1
• Browser: Chrome 146
• Version: Mantine Core 8.3.18, Mantine Datatable 8.3.13

Additional context
It appears that removing the initial column width resolves this issue; however, I'd still be interested in a resolution or workaround to allow columns to be set to different sizes.

[gfazioli]

Hi @mgoetz-nerdery — this might be fixed by #803. isLocked is now derived from the current state, so a mixed snapshot (some pixel widths, some 'auto') drops the table back to auto layout instead of leaving columns at 0 px.

If you can spare a few minutes to test the original repro (the codesandbox you linked) against the fix/789-resize-rewrite branch on my fork (gfazioli/mantine-datatable) and confirm whether the issue still reproduces, that would help close this out.

[mgoetz-nerdery]

Hi @mgoetz-nerdery — this might be fixed by #803. isLocked is now derived from the current state, so a mixed snapshot (some pixel widths, some 'auto') drops the table back to auto layout instead of leaving columns at 0 px.

If you can spare a few minutes to test the original repro (the codesandbox you linked) against the fix/789-resize-rewrite branch on my fork (gfazioli/mantine-datatable) and confirm whether the issue still reproduces, that would help close this out.

Yes, I was able to test this and it looks like it passes! Thank you!

[icflorescu]

Thanks, @gfazioli!