1424918 - Small allocated space for “Answers/Questions” on “Chat” page

Status: RESOLVED DUPLICATE of bug 1417667

(Core :: Layout, defect, P3)

Description

[Eric Tsai (no more review request accepted)]

STR:

1. Navigate to: http://mishu.baidu.com/app.html?from=7&refer=7_2.
2. Tap the available questions or type in some questions.
3. Observe answers.
 
**Expected Behavior:**
Questions/Answers are fully visible.

**Actual Behavior:**
Questions/Answers are cropped on bottom side.

**Note:**
1. Reproducible on Firefox 55.0.2 Release (Mobile). 
2. Not reproducible on Chrome (Mobile) 60.0.3112.107.
3. Screenshot attached.

**Watchers:**
@softvision-sergiulogigan
@softvision-oana-arbuzov

sv; country: tw
https://webcompat.com/uploads/2017/9/5f41d47e-c7b6-4f79-9ff1-4d6f6c234fa2.jpeg

![q acropped](https://user-images.githubusercontent.com/12184325/30154286-20261434-93c2-11e7-81cf-4322ac930a77.gif)

Comment 1

[Eric Tsai (no more review request accepted)]

Simplified version: https://codepen.io/MDTsai/pen/POrdZX and https://codepen.io/MDTsai/pen/RjOOyb for the both see also webcompat issue.

Comment 2

[Astley Chen (inactive)]

As it might be related to reflow code(computed value is correct), TY, would you like to take a look first? Thanks.

Comment 3

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

From the test case in comment 1, it seems that the contents of the #inner are overflow to the padding-box of the #outer.  Several bugs (Bug 1099204, Bug 1277006 and Bug 1417667) are similar to this one. 

This should be something related to the overflow-clip-box. This causes web-compact issues because our model is different from other engines.

Mats, could you help on this?

Comment 4

[Xidorn Quan [:xidorn] UTC+10]

It seems to me this is probably a duplicate of bug 1417667, and that is indeed a bug. Both paddings should be taken into account for scroll area no matter what the overflow-clip-box is. It should be able to scroll content to align its end with the content box rather than the padding box.