fix(dimension): lay automatic text out from the style again (#1412)

Since the stored text point became authoritative (85619f49), new linear
and aligned dimensions drew their text at the placeholder the commands
stored (the middle of the dimension line), so DIMTAD Above/Below and the
text offset had no effect; a style or override edit left the stale point
in place too.

reset_automatic_text_position clears the point of text the user did not
place, so it is laid out from the current settings. DIMLINEAR, DIMALIGNED,
DIMBASELINE, DIMCONTINUE and QDIM call it on creation; a DIMSTYLE edit, a
dimension override row and a style change call it for the dimensions they
touch. Loaded, untouched dimensions keep their pictured position.

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

src/modules/annotate/aligned_dim.rs

@@ -92,6 +92,7 @@ pub(crate) fn aligned_dimension_entity(
     let (d1, d2) = dim_line_endpoints(first, second, point);
     dim.base.text_middle_point = v3((d1 + d2) * 0.5);
     dim.base.insertion_point = dim.base.text_middle_point;
+    crate::entities::dimension::reset_automatic_text_position(&mut dim.base);
     dim.base.actual_measurement = dim.measurement();
     crate::entities::dimension::set_dimension_text_override(&mut dim.base, text_override);
     EntityType::Dimension(Dimension::Aligned(dim))

src/modules/annotate/dim_baseline.rs

@@ -546,6 +546,7 @@ fn build_linear(
         result.base.definition_point = result.definition_point;
         result.base.text_middle_point = world(plane, first_line.lerp(second_line, 0.5));
         result.base.insertion_point = result.base.text_middle_point;
+        crate::entities::dimension::reset_automatic_text_position(&mut result.base);
         Some(Dimension::Aligned(result))
     } else {
         let mut result = DimensionLinear::new(world(plane, fixed), world(plane, point));
@@ -554,6 +555,7 @@ fn build_linear(
         result.base.definition_point = result.definition_point;
         result.base.text_middle_point = world(plane, first_line.lerp(second_line, 0.5));
         result.base.insertion_point = result.base.text_middle_point;
+        crate::entities::dimension::reset_automatic_text_position(&mut result.base);
         Some(Dimension::Linear(result))
     }
 }

src/modules/annotate/dim_continue.rs

@@ -453,6 +453,7 @@ fn build_linear(
     result.base.definition_point = result.definition_point;
     result.base.text_middle_point = world(plane, first_line.lerp(second_line, 0.5));
     result.base.insertion_point = result.base.text_middle_point;
+    crate::entities::dimension::reset_automatic_text_position(&mut result.base);
     Dimension::Linear(result)
 }
 
@@ -565,7 +566,8 @@ fn preview_for_dimension(dimension: &Dimension) -> WireModel {
                 project(&plane, value.second_point),
                 value.rotation,
                 project(&plane, value.definition_point),
-                project(&plane, value.base.text_middle_point),
+                (value.base.text_middle_point != Vector3::ZERO)
+                    .then(|| project(&plane, value.base.text_middle_point)),
                 value.base.actual_measurement,
             );
         }
@@ -634,7 +636,7 @@ fn linear_preview(
     second: Vec2,
     rotation: f64,
     definition: Vec2,
-    text: Vec2,
+    text: Option<Vec2>,
     measurement: f64,
 ) {
     let axis = Vec2::new(rotation.cos(), rotation.sin());
@@ -642,6 +644,8 @@ fn linear_preview(
     let coordinate = definition.dot(perpendicular);
     let first_line = project_to_line(first, perpendicular, coordinate);
     let second_line = project_to_line(second, perpendicular, coordinate);
+    // Automatic text stores no point; mark the middle of the dimension line.
+    let text = text.unwrap_or_else(|| first_line.lerp(second_line, 0.5));
     segment(points, plane, first, first_line);
     segment(points, plane, second, second_line);
     segment(points, plane, first_line, second_line);

src/modules/annotate/linear_dim.rs

@@ -140,6 +140,7 @@ pub(crate) fn linear_dimension_entity(
     dim.base.definition_point = dim.definition_point;
     dim.base.text_middle_point = v3(linear_text_pos(first, second, point, axis));
     dim.base.insertion_point = dim.base.text_middle_point;
+    crate::entities::dimension::reset_automatic_text_position(&mut dim.base);
     dim.base.actual_measurement = dim.measurement();
     crate::entities::dimension::set_dimension_text_override(&mut dim.base, text_override);
     EntityType::Dimension(Dimension::Linear(dim))

src/modules/annotate/qdim.rs

@@ -201,6 +201,7 @@ impl QdimCommand {
         dimension.base.definition_point = v3(definition);
         dimension.base.text_middle_point = v3(text);
         dimension.base.insertion_point = v3(text);
+        crate::entities::dimension::reset_automatic_text_position(&mut dimension.base);
         dimension.base.actual_measurement = dimension.measurement();
         let association = DimensionAssociationInput::Explicit(vec![first.sources.first().copied(), second.sources.first().copied()]);
         (self.plane.place_entity(EntityType::Dimension(Dimension::Linear(dimension))), association)