Re: [isabelle] A more adequate workaround for jEdit scaling on hidpi / high resolution

Thanks for looking into it!

The setting is incompatible with GTK+ look and feel since inherited UI
elements and settings seem to be scaled twice.

With regard to the Cancel button, it seems to be a very edge case:
increasing the point size from 12 -> 13 using the Isabelle fonts without
the scaling setting gives the same defective "Can..." result, and
decreasing the point size 12 -> 11 using the Isabelle fonts with scaling
resolves the issue. Using the default Dialog font for standalone jEdit in
the usual 12 points does not seem to result this defect under scaling.


On Tue, Jul 23, 2019 at 6:32 PM Makarius <makarius at> wrote:

> On 22/07/2019 08:10, Johannes Choo wrote:
> > There exists a
> > different workaround that should produce better results in most
> situations.
> >
> > You will have to invoke Isabelle/jEdit via the command line, and pass in
> > the option `-J "-Dsun.java2d.uiScale=2.0"`. For example,
> >
> > ```
> > $ isabelle jedit -J "-Dsun.java2d.uiScale=2.0"
> > ```
> >
> > this should uniformly scale all UI elements by 2x. Other integer
> quantities
> > should work as well.
> I did not know this property yet, thanks for pointing it out.
> Trying it briefly with the Java 11 that is bundled with Isabelle2019, it
> basically works, but in the default "Metal" L&F there are occasional
> font-metric problems (button "Cancel" displayed as "Can..."). With
> "GTK+" L&F there seems to be a conflict with its own GUI scaling (which
> I usually use on Linux, but that is not quite portable and thus not the
> default).
> So there is both some improvement and some remaining
> complexity/fragility here. I will try again with the Java version that
> will be bundled with the next Isabelle release (presumably March/April
> 2020).
>         Makarius


Email: jhanschoo at
Skype: jhanschoo
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