https://bugs.kde.org/show_bug.cgi?id=363423
Bug ID: 363423
Summary: widget misalignment with the "Macintosh" native
platform theme
Product: frameworks-kguiaddons
Version: unspecified
Platform: Compiled Sources
OS: OS X
Status: UNCONFIRMED
Severity: major
Priority: NOR
Component: general
Assignee: kdelibs-b...@kde.org
Reporter: rjvber...@gmail.com
There is a longstanding bug somewhere in Qt or a KDE component that causes
misalignment of certain widgets on OS X, when the native platform theme/style
is used. With KDE4 this was so frequent that we (MacPorts) strongly suggested
using QtCurve as the default theme, something which was then still possible
with an unpatched Qt. We did report the issue, but it was never addressed.
It has become less frequent with KF5, but it still exists. The best showcase we
found in KDE4, kcalc, is still affected, but it can also be seen in Kate's
search & replace panel. Symptoms are:
- overlapping widgets
- widgets that are not large (high, usually) enough for the text
Affected widgets include buttons and comboboxes but I cannot exclude the
possibility others are concerned too. There may be a link with font family or
font size: KDE applications using a standard Qt and the native platform theme
usually get end up using the same typeface (Lucida Sans 13) for almost
everything because that's how Qt initialises the fontroles KDE uses. Clearly
the buttons in kcalc do not use that typeface.
I'm filing this under kguiaddons, but I actually have no idea where the bug
might be - it could even be in individual applications, but I wouldn't be
surprised if it's in Qt itself. It is *not* purely in Qt's cocoa QPA plugin.
One can build Qt for use under X11 on OS X, and install the resulting xcb qpa +
dependencies in a normal build for cocoa. One can then launch, say, `kcalc5
-platform xcb -style macintosh` and it won't load the cocoa qpa but still have
access to and use the Macintosh widget style. You get the same rendering
glitches, which is why I expect the bug might be in Qt's drawing routines that
render the "native" widgets (scoop: they're not rendered with "official" SDKs,
there's no NSButton instance hiding behind a QButton).
Reproducible: Always
Actual Results:
See the screenshot I'll be attaching.
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