fix: respect drawing units for annotative text

src/app/mtext_editor.rs

@@ -705,7 +705,7 @@ impl super::OpenCADStudio {
         // it keeps the layout's shape, wrapping and alignment identical.
         mt.insertion_point = Vector3::new(0.0, 0.0, 0.0);
         let entity = EntityType::MText(mt.clone());
-        let anno = self.tabs[i].scene.annotation_scale;
+        let anno = 1.0;
         let bg = self.tabs[i].scene.bg_color;
         let wires: Vec<WireModel> = tessellate::tessellate(
             &self.tabs[i].scene.document,

src/app/update/file.rs

@@ -1147,6 +1147,10 @@ pub(super) fn on_open_file(&mut self) -> Task<Message> {
                 // CANNOSCALEVALUE (paper/drawing factor). Convert its inverse into
                 // drawing units as well: metric annotation sizes are paper millimetres
                 // and imperial annotation sizes are paper inches.
+                // Current model-space annotation scale comes from the drawing's
+                // CANNOSCALEVALUE (paper/drawing factor). Convert its paper unit into
+                // the drawing's INSUNITS as well, so e.g. a metre drawing uses
+                // 0.001 model units for 1 mm of paper at 1:1.
                 let cannoscale_value = self.tabs[i].scene.document.header.annotation_scale_value;
                 let unit_factor = self.tabs[i].scene.annotation_scale_unit_factor();