Text rotation

What it does

Select a cell or range and open the toolbar's Text rotation popover (or Format → Text rotation) to rotate the cell's text to one of Sheets' four angle presets — Tilt up (45°), Tilt down (-45°), Rotate up (90°), Rotate down (-90°) — or type a custom angle from -90° to 90°. None clears the rotation back to the default (unrotated).

A positive angle pivots the text at the cell's bottom-left corner and reads counter-clockwise (ascending for a tilt, bottom-to-top for a 90° rotation); a negative angle pivots at the top-left and reads clockwise. Rotation is a presentation attribute, separate from the cell's value: rotating =A1+B1 angles the drawn number without touching the formula. It is per-cell, survives value edits, undoes/redoes like any other edit, and resets with Clear formatting.

Not built in this slice (see the oracle brief for the full reasoning):

• Stack vertically — a distinct one-character-per-line layout Sheets also offers, not an angle, so it doesn't fit the rotation: number field this issue asked for.
• Row-height growth for a rotated cell — Sheets visibly grows the row to fit the rotated bounding box; Studio's rotated text instead clips at the cell's existing rect, the same fallback any other overflowing cell gets.

Verified behavior

Matches Google Sheets: In Google Sheets, the toolbar's "Text rotation" popover offers six presets (None, Tilt up, Tilt down, Stack vertically, Rotate up, Rotate down) plus a free custom-angle input; Tilt up = 45°, Tilt down = -45°, Rotate up = 90°, Rotate down = -90° (verified live — features/format-rotation.oracle.md — by reading the custom-angle dropdown's highlighted value while each preset was active, never self-confirmed). A positive angle pivots the text at the cell's bottom-left corner and reads counter-clockwise (ascending left-to-right for a tilt, bottom-to-top for a 90° rotation); a negative angle pivots at the top-left and reads clockwise. Sheets grows the row to fit the rotated bounding box. "Stack vertically" is a distinct layout (one character per line, no angled baseline at all) — not a point on the angle continuum — and is out of scope for this slice; so is row-height growth for rotation. Rotation is a per-cell presentation attribute like every other CellFormat field: it never touches the value or formula, and undoes/redoes with the command log.

Tilt up sets a 45° rotation (Format menu)

Given

• A1 = hello

When I click A1, then click menu item format.rotateTiltUp

Then

• A1 is rotation=45

Tilt up sets a 45° rotation (toolbar) — the SAME seam as the Format menu, driven end to end

Given

• A1 = hello

When I click A1, then open the text-rotation dropdown, then pick tiltUp from the text-rotation dropdown

Then

• A1 is rotation=45

Rotate down sets a -90° rotation and is presentation only — value/formula untouched

Given

• A1 = =2+3

When I click A1, then click menu item format.rotateDown

Then

• A1 shows 5
• A1 has formula =2+3
• A1 is rotation=-90

rotation survives a value edit

Given

• A1 = x

When I click A1, then click menu item format.rotateTiltDown, then type changed into A1

Then

• A1 shows changed
• A1 is rotation=-45

rotation undoes and redoes with the command log

Given

• A1 = x

When I click A1, then click menu item format.rotateUp, then undo, then redo

Then

• A1 is rotation=90

Clear formatting resets rotation back to none

Given

• A1 = x

When I click A1, then click menu item format.rotateTiltUp, then click menu item format.clearFormatting

Then

• A1 is rotation=false

the None preset explicitly clears an existing rotation

Given

• A1 = x

When I click A1, then click menu item format.rotateTiltUp, then click menu item format.rotateNone

Then

• A1 is rotation=false

rotating a wide cell's text grows its row, matching Sheets

Given

• A1 = a fairly long piece of rotated text

When I click A1, then click menu item format.rotateTiltUp

Then