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| -rw-r--r-- | CLAUDE.md | 13 |
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@@ -195,6 +195,19 @@ configured **Bold** in qt6ct, so every row rendered bold and `setBold(true)` cha nothing. Before concluding a Qt facility is broken, check the desktop's own font and theme configuration. +**`QString::arg()` does not collapse `%%` into `%`.** `printf` does, and the habit +transfers silently. In generated CSS this is quietly destructive: every percentage written +`%%` to escape it reaches the browser malformed, and a browser does not report a bad +declaration, it **drops that one rule and renders the rest**. The 0.11.0 placeholder lost +its mask, its glow and both radial gradients this way while still painting a plausible +pane, so nothing looked broken. Write `%` directly; `arg()` only ever consumes `%1`..`%99`. + +The reason it survived review is worth more than the rule: **a geometry probe endorsed the +layout**, because it measured only properties that carried no percentage. A probe that +cannot see the thing that breaks will report success forever. When asserting on generated +CSS, assert on the **generated string** as well as on the rendered result, and make sure +the assertion covers the declarations that actually went missing. + ## Web view security The most security-sensitive area: a browser engine pointed at input from strangers. Do not |