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Write font descriptions in the stable Qt 5 10/11-field format

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QFont::toString() is not stable across Qt versions: Qt 6.11 switched to
a 19-field format carrying OpenType weights, which QFont::fromString()
of Qt 5.x and Qt <= 6.10 rejects, leaving a broken font. Projects saved
by a Qt 6.11+ build were therefore unreadable by older builds.

Add QETUtils::fontToString() composing the legacy 10/11-field
description (weight mapped back to the legacy scale with the same
closest-match table Qt uses when parsing) and use it at every site that
stores a font description in a project, element, table config or
settings file. Every Qt version from 5.15 through 6.12-beta parses this
form correctly, so files stay readable by every QET build in
circulation.

See issue #553.
This commit is contained in:
Dieter Mayer
2026-07-30 21:45:23 +02:00
parent 120ca08209
commit 5da1fe5fc8
11 changed files with 77 additions and 11 deletions
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sources/utils/qetutils.h
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@@ -32,6 +32,7 @@ namespace QETUtils
QMargins marginsFromString(const QString &string);
qreal graphicsHandlerSize(QGraphicsItem *item);
void pixelSizedFont (QFont &font);
QString fontToString (const QFont &font);
bool sortBeginIntString(const QString &str_a, const QString &str_b);