The language version appears in two places that share a name but not a
concept, which repeatedly reads as one confused API: on
DecompilerSettings it is a construction shortcut (SetLanguageVersion
initializes the feature flags once and the version is not stored, so
the flags are the only state and the call is deliberately one-way),
while on WholeProjectDecompiler it is an export parameter (the
LangVersion stamped into the project file, defaulting to
GetMinimumRequiredVersion() and rejected below it as a safety net
against exporting uncompilable projects). Spell both roles out in the
XML docs so the distinction no longer has to be reverse-engineered.
Assisted-by: Claude:claude-fable-5:Claude Code
These three settings were disabled by SetLanguageVersion for older
targets but, unlike every comparable syntax-preference setting, never
raised GetMinimumRequiredVersion while enabled - an omission that had
gone unnoticed in the handwritten version bookkeeping. Drop the
AffectsMinimumRequiredVersion escape hatch that reproduced it.
Assisted-by: Claude:claude-fable-5:Claude Code
Every version-gated setting was bookkept in four places that had to stay
in sync by hand: the property boilerplate, SetLanguageVersion,
GetMinimumRequiredVersion, and the [Category] display string - and that
sync had already drifted in a handful of settings. A new source
generator in ICSharpCode.Decompiler.Generators now derives all four
from a single [DecompilerSetting] attribute on a partial property:
backing field, accessors with change notification, the version-derived
[Category], and both version methods. [Description] stays handwritten
because its resource keys are irregular and are grepped from the resx.
This commit is a 1:1 translation: the current inconsistencies are
reproduced exactly (AffectsMinimumRequiredVersion = false on
ExtensionMethods, UseLambdaSyntax and UseEnhancedUsing; no gate on
SwitchOnReadOnlySpanChar), verified against the old build by comparing
SetLanguageVersion and GetMinimumRequiredVersion behavior for every
setting at every language version, plus a reflection diff of the full
per-property attribute surface.
Assisted-by: Claude:claude-fable-5:Claude Code
Siegfried Pammer