[BUG] Bad grid mode after changing orientation

[jesmrec]

Steps to reproduce

1. In list mode, set the device in landscape
2. Change to grid
3. Set the device in portrait

Actual behaviour

Icons and thumbnails are overlapped like:

Expected behaviour

Correctly displayed like:

Xiaomi Redmi Note 13
Android 15

[DeepDiver1975]

Confirmed. Root cause: the grid column count is never recomputed on rotation.

• spanCount for grid mode is set from ColumnQuantity.calculateNoOfColumns() only at init (MainFileListFragment.kt:394) and on the view-type toggle (MainFileListFragment.kt:1006).
• onConfigurationChanged (MainFileListFragment.kt:332) calls updateConfigDependentSizes() (:337), which resizes only the space-header card and empty-state icon — it does not touch layoutManager.spanCount.
• calculateNoOfColumns() is width-dependent (ColumnQuantity.kt:45, uses displayMetrics.widthPixels), so the count computed in landscape (wide → more columns) stays applied after rotating to portrait (narrow), overlapping items. Matches the repro (set grid in landscape, rotate to portrait).

Fix outline: recompute and reapply the grid span in updateConfigDependentSizes() when the current view type is grid, e.g. if (viewType == ViewType.VIEW_TYPE_GRID) layoutManager.spanCount = ColumnQuantity(requireContext(), R.layout.grid_item).calculateNoOfColumns(), then re-lay-out.

Same orientation/config-change area as #4803.

Aside: calculateNoOfColumns() at ColumnQuantity.kt:48 computes numberOfColumns.minus(1) but discards the result (not reassigned) — the intended column reduction is a no-op. Worth fixing alongside.

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