[Bug] Interface scaling issue on HiDPI

[Redsandro]

4k monitor on Linux Mint 18.3 AKA Ubuntu 16.04.3 here.

Interestingly, while those dialogs boxes itself (not their content) are sized properly on my 4k monitor, the Desktop Client itself is not scaled with the system scale mode, so it's a client for ants, as Dereck Zoolander would say. :ant:

[Redsandro]

Different computer, different monitor.

[Redsandro]

It is as if:

• Dialog fonts are drawn correct (i.e. according to the Cinnamon Desktop Environment UI scaling setting, e.g. global.ui_scale, 2x)
• Client UI not correct (1x), but listening to QT_SCALE_FACTOR
• Dialog widgets not correct, _and not listening to QT_SCALE_FACTOR either._

So in order to make the interface readable/bigger, you need to launch Seafile-Client with:

env QT_SCALE_FACTOR=2 seafile-applet

However

• This doubles the dialog fonts (that were already correct @2x) too.
• Dialog widgets are not listening to the scale factor.

The problem:

Auto-detect:

• Desktop scaling: 2x
• Seafile-Client Dialog Font scaling: 2x
• Seafile-Client Dialog Widget scaling: 1x
• Seafile-Client scaling: 1x

QT_SCALE_FACTOR=2:

• Desktop scaling: 2x
• Seafile-Client Dialog Font scaling: 4x
• Seafile-Client Dialog Widget scaling: 1x
• Seafile-Client scaling: 2x

[lins05]

The client works properly with HDPI monitor on windows and mac, but since we haven't used a linux machine with HDPI we haven't tested on it.

We'll try to reproduce and fix it.

[Redsandro]

@lins05 thank you for the heads up.

If it helps: I have two workstations with a multi-monitor setup with 1 UHD monitor and 2 HD monitors. In this case, the interface doesn't auto-detect, so the user interface is set to UHD scaling @ 2x in the general settings.

This might be irrelevant, or it might aid in Seafile's confusion.

[lins05]

@Redsandro There is some problem for the seafile client dealing with multiple monitors at this moment. Have you tried with only 1 monitor (and unplug other monitors) to see if that works? This could help us narrow down the problem scope.

Also you can try the QT_SCREEN_SCALE_FACTORS env var, as a comma-separated list of the scale factors for all the monitors, e.g.

$ export QT_SCREEN_SCALE_FACTORS=2,4
$ seafile-applet

[Redsandro]

Hi @lins05. I figured the multi-monitor thing is actually irrelevant. The scaling problem occurs on single UHD monitor machines too.

[Redsandro]

Note to self: Try some of the comments mentioned in #809

-Update- Doesn't work. Scales everything down, including these artefacts:

[Redsandro]