FIELD: codec field fixes, six-decimal real system variables

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Cargo.lock

@@ -4206,7 +4206,7 @@ dependencies = [
 [[package]]
 name = "opencadcodec"
 version = "0.5.5"
-source = "git+https://github.com/ramox81/cadcodec.git?rev=22a5c3e#22a5c3e07bf9eda6b7937e951906f8aa53fdeaf3"
+source = "git+https://github.com/ramox81/cadcodec.git?rev=595800e#595800ed4b778827c3c9e48245cade9cd8ccc05a"
 dependencies = [
  "ahash 0.8.12",
  "anyhow",

Cargo.toml

@@ -92,7 +92,7 @@ objc2-foundation = { version = "0.2", features = ["NSArray", "NSURL", "NSString"
 
 # Field authoring API and field format codes (opencadcodec PR pending).
 [patch."https://github.com/HakanSeven12/opencadcodec.git"]
-opencadcodec = { git = "https://github.com/ramox81/cadcodec.git", rev = "22a5c3e" }
+opencadcodec = { git = "https://github.com/ramox81/cadcodec.git", rev = "595800e" }
 
 [patch.crates-io]
 iced_core = { git = "https://github.com/iced-rs/iced.git", rev = "23604ff22ab0aad9e00b9327cb7b8546ed84db39" }

src/entities/field.rs

@@ -101,9 +101,10 @@ pub const SYSVARS: &[&str] = &[
     "userr4", "userr5",
 ];
 
+/// Real system variables show six decimals, as the reference shows them
+/// (TEXTSIZE 2.500000).
 fn num(v: f64) -> String {
-    let t = format!("{v:.4}");
-    t.trim_end_matches('0').trim_end_matches('.').to_string()
+    format!("{v:.6}")
 }
 
 /// A system variable's value as a field shows it.