Same here, (XFCE+XOrg on Manjaro Linux).
After some playing around:
- Downgrading back to 7.2 seems to resolve the issue completely
- Starting with default settings (renamed .config/calibre to something else) and starting fresh doesn't solve the issue
- Narrowing an existing (unaffected) column to its narrowest state introduces the issue to that column until it's widened again
- Narrowing an unaffected column (both custom and default) to its narrowest state and restarting introduced the issue that that column
- Increasing the width to one of the affected columns seems to fix it for all columns
- Resizing an unaffected column (from the start) does NOT solve the issue, ever after narrowing it first
- Affected columns seem to all be narrower than 65pixels, at least widening it to 65 or more fixes the issue
- Fixes only hold until a restart
- So far the only thing that seems to work consistently is resetting all afflicted columns to >65px (recommended width, double click divider in header, works for this).
No idea about the why of it all or how to solve/debug it.
It seems to be 7.3 specific and doesn't involve non-standard settings (like custom columns or column colouring/icons)
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