250907 - Installer does not correct image scaling for DPI setting

Status: NEW

(Thunderbird :: Installer, defect)

Description

[Brant Gurganus]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7) Gecko/20040707 Firefox/0.9.2
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7) Gecko/20040707 Firefox/0.9.2

The Mozilla Thunderbird installer does not scale its graphical components
properly based on the user's DPI setting.  The attached screenshot gives an
example of what can result:  The "Welcome to Mozilla Thunderbird" text is clipped.

Reproducible: Always
Steps to Reproduce:
1. Set DPI to 133.
2. Run installer.
Actual Results:  
The "Welcome to Mozilla Thunderbird" text gets clipped.

Expected Results:  
No graphical component gets clipped.

Other graphical settings which may be useful in recreating this issue are:
Resolution: 1280x1024
Color Depth: 32-bit

Additionally, Microsoft has a technical document on how to correct for this
issue on Windows at: ().

Comment 1

[Brant Gurganus]

Attachment: Screenshot of Installer with Clipped Panel

Additionally, here is that URL on how to correct for DPI:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dngdi/html/highdpiapp.asp

Comment 2

[Roger Wray]

I just found that I have a problem with TB's dpi scaling - it doesn't work at all. I have a 1080p display and this is a problem. I also noticed that there is no way to increase (zoom) the composition pane either; medium size looks like size 4 and the reply text maintains this size. I currently have my dpi set @ 125% and it has no effect on TB.

Comment 3

[Wayne Mery (:wsmwk)]

I used non-default DPI for a long time and I'm pretty sure this is still the case. But I suspect this should be closed wontfix - I don't think the installer will ever have the code to handle non-default display settings that we have in the full product, i.e. what we have after startup is done.

Comment 4

[Wayne Mery (:wsmwk)]

See also

• Bug 1588892 - Full installer window doesn't resize properly following resolution change
• Bug 305797 - Firefox installer / uninstaller screens ignore system contrast and font size
• Bug 1617211 - Investigate ways to improve full installer image scaling (which states some improvements were made in Bug 1515534 - Image and icon in installer are pixelated - for Firefox 74
• Bug 1617197 - Full installer header fonts look bad on some OS locales

Comment 5

[Brant Gurganus]

I couldn't reproduce this with latest installer on Windows 11. I believe display scaling methods in Windows have changed and with higher resolution screens, Windows has stock scalings it promotes from 100%, 125%, 150%, 175%. Custom scalings can be set from 100% to 500%. Okay to close with me unless someone else can reproduce. When I originally opened this, the setting was a DPI setting so 96dpi was stock and 133dpi would have been about 139%