1715178 - Subgrid's intrinsic size doesn't include its scrollbar size

Status: RESOLVED DUPLICATE of bug 1879770

(Core :: Layout: Grid, defect)

Description

[Ting-Yu Lin [:TYLin] (PDT, UTC-7)]

Attachment: Testcase 1

Testcase 1 is derived from https://github.com/w3c/csswg-drafts/issues/6350#issuecomment-856150927

It seems we don't include the subgrid's scrollbar when computing it's intrinsic size. In addition, dynamically remove border on the subgrid doesn't produce a stable layout.

Comment 1

[Ting-Yu Lin [:TYLin] (PDT, UTC-7)]

Attachment: Screenshot of Testcase 1 (after clicking the "Remove border" button)

Comment 2

[Tiaan Louw]

Initially it looks like when the size of the track containing the subgrid is calculated, the HTMLScrollbarFrame reports the actual scrollbar sizes as 0. That is when you recreate the frame tree without changing anything, the correct sizes for the track is calculated, because the HTMLScrollbarFrame already did a Reflow and knows the actual scrollbar sizes.

I'm investigating how to overcome this.

Comment 3

[Tiaan Louw]

Attachment: WIP: Bug 1715178 - Take scrollbar sizes into account when calculating intrinsic size of subgrid.

WIP

Comment 4

[Ting-Yu Lin [:TYLin] (PDT, UTC-7)]

Bug 1879770 fixed this bug, too.