1427524 - Dropdown (right-click) menu padding increases when increasing DPI, decreases when decreasing

Status: NEW

(Core :: XUL, defect)

Description

[nyanpasu64]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:58.0) Gecko/20100101 Firefox/58.0
Build ID: 20171226085105

Steps to reproduce:

1. Login to Windows.
2. Under PC settings, change DPI scaling. (If you're using a HiDPI laptop, plug or unplug an external monitor.)
3. Open Firefox.
4. Right-click a page.


Actual results:

If current DPI is greater than login DPI, the padding around right-click menu items will be greater than normal. (I define normal as logging out, back in, and reopening Firefox.)

If current DPI is less than login DPI, the padding around right-click menu items will be less than normal.



Expected results:

[Menu padding before logging out] should match [menu padding after logging out/in under the new DPI setting].

Comment 1

[nyanpasu64]

Attachment: 96dpi

Comment 2

[nyanpasu64]

Attachment: 120dpi login, 96dpi current screenshot. Padding is smaller.

Comment 3

[nyanpasu64]

(Unrelated, but it seems that the extension menu items' order is different. Is this a bug?)

Comment 4

[Neil Deakin]

Does this happen on all context menus or just the main page one?

Comment 5

[nyanpasu64]

I think this happens to all menus, including the menu bar, bookmark bar dropdowns, etc.
I don't know if this happens to new-style white-background dropdowns.

Also I switched from 100 to 125% while Firefox was open, and get these weird black lines. Is this GPU-driver-specific? Worth reporting?

Comment 6

[nyanpasu64]

Attachment: Weird lines when moving mouse between bookmark menu entries at 100->125% scaling.

Comment 7

[nyanpasu64]

Confirmed, new-style white-background dropdowns are unaffected (identical between 100% and 125->100% scaling).