Re: Decreasing seams in scaled windows

Neil:

I think it makes sense to commit this and then I=E2=80=99ll send you patche=
s in the next few days to go on top of this. One change to maybe make now i=
s to ifdef out the full repaint for Wayland if SCINTILLA_QT_BACKINGSTORE_FI=
XED is defined.

Thanks,

John

> On Jun 23, 2026, at 11:28=E2=80=AFPM, Neil Hodgson <scintilladotorg@gmail=
.com> wrote:
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> John:
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>> I=E2=80=99ve been unable to reproduce, possibly because my Wayland setup=
 is different than yours.
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> Yes, it could be system, library, or font matching issues. It could
> also be occurring or not because of minor differences: lucking into an
> evenly divisible line height or having the top of Scintilla at
> different scale phases.
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>> I=E2=80=99m using a Ubuntu 24.04 based system and when the system displa=
y magnification is set to 150%, Wayland uses a 2.0 device pixel ratio and t=
hen scales the 200% to 150%.
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> OK, that is probably what is occurring to me since there is an initial
> integer devicePixelRatioF then the DevicePixelRatioChange event
> arrives and it updates to 1.5.
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>> My take now is that Qt scaling is buggy on macOS and Wayland =E2=80=94 t=
he listbox and menus show more debris than scintilla does when the highligh=
ted item moves.
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> So, should I commit a version (attached) that leaves Wayland with
> full-window invalidation for non-integer scaling? That would make it
> easier for people to experiment with this since the bulk of the code
> is more easily downloaded.
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> Patch includes your SCINTILLA_QT_BACKINGSTORE_FIXED change for macOS.
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> Neil
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> <QtScaleK.patch>

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