fix(pointstyle): stage dialog edits until accepted

Keep PDMODE and PDSIZE changes in the Point Style dialog until OK. Cancel and close discard staged edits. Invalid or non-finite size input reports an error and keeps the dialog open. Commit both values with one undo snapshot.

test: cancel discards staged glyph and size edits

test: invalid point size reports error and stays open

test: OK commits glyph and size in one undo step

test: relative point size keeps its sign

src/app/commands/styleprops.rs

@@ -4154,13 +4154,7 @@ impl OpenCADStudio {
                 }
             }
             cmd if cmd == "DDPTYPE" || cmd == "PTYPE" => {
-                // The dialog shows the magnitude; the sign (relative/absolute)
-                // is driven by the radio buttons. A positive PDSIZE is absolute;
-                // zero or negative is relative.
-                let pdsize = self.tabs[i].scene.document.header.point_display_size;
-                self.point_size_relative = pdsize <= 0.0;
-                self.point_size_buf = format!("{}", pdsize.abs());
-                self.active_modal = Some(super::super::ModalKind::PointStyle);
+                self.begin_point_style_dialog();
             }
             "LWDISPLAY" => {
                 use crate::command::ValuePromptCommand;

src/app/mod.rs

@@ -1247,6 +1247,12 @@ pub(super) struct OpenCADStudio {
     marketplace_status: String,
     /// PDSIZE text buffer for the Point Style (DDPTYPE) dialog.
     point_size_buf: String,
+    /// Tab that owns the staged Point Style edits, so OK cannot write to a
+    /// different document if the active tab changes while the dialog is open.
+    point_style_tab_id: Option<u64>,
+    /// Staged PDMODE selection; the document is changed only when the dialog
+    /// is accepted.
+    point_mode_buf: Option<i16>,
     /// Point Style size mode: `true` = relative to screen, `false` = absolute.
     /// Tracked separately from the PDSIZE sign so a size of 0 (sign-less) still
     /// remembers which radio is active.
@@ -5024,6 +5030,8 @@ impl OpenCADStudio {
             plugin_readme_loading: rustc_hash::FxHashSet::default(),
             marketplace_status: String::new(),
             point_size_buf: String::new(),
+            point_style_tab_id: None,
+            point_mode_buf: None,
             point_size_relative: true,
             default_assoc_prompted: false,
             check_missing_fonts: true,

src/app/update/mod.rs

@@ -196,6 +196,10 @@ impl OpenCADStudio {
         ) {
             self.style_stage_discard();
         }
+        if self.active_modal == Some(PointStyle) {
+            self.point_style_tab_id = None;
+            self.point_mode_buf = None;
+        }
         if self.active_modal == Some(ScaleManager) {
             self.scale_stage_discard();
         }
@@ -10588,7 +10592,6 @@ impl OpenCADStudio {
             }
             Message::PointStyleSizeRelative(relative) => {
                 self.point_size_relative = relative;
-                self.apply_point_size();
                 Task::none()
             }
             Message::PointStyleSizeInput(s) => {
@@ -10596,12 +10599,13 @@ impl OpenCADStudio {
                 Task::none()
             }
             Message::PointStyleApplySize => {
-                self.apply_point_size();
+                self.validate_point_size_input();
                 Task::none()
             }
             Message::PointStyleOk => {
-                self.apply_point_size();
-                self.close_active_modal();
+                if self.commit_point_style_dialog() {
+                    self.close_active_modal();
+                }
                 Task::none()
             }
 
@@ -12933,3 +12937,106 @@ fn web_autosave_due(savetime_min: i32) -> bool {
         fire
     })
 }
+
+#[cfg(test)]
+mod point_style_dialog_tests {
+    use super::{Message, OpenCADStudio};
+    use crate::app::ModalKind;
+
+    fn open_with_values(mode: i16, size: f64) -> OpenCADStudio {
+        let mut app = OpenCADStudio::new_for_test();
+        app.tabs[app.active_tab]
+            .scene
+            .document
+            .header
+            .point_display_mode = mode;
+        app.tabs[app.active_tab]
+            .scene
+            .document
+            .header
+            .point_display_size = size;
+        app.begin_point_style_dialog();
+        app
+    }
+
+    #[test]
+    fn closing_point_style_discards_glyph_and_size_edits() {
+        let mut app = open_with_values(2, 3.0);
+
+        let _ = app.update(Message::PointStyleSetMode(3));
+        let _ = app.update(Message::PointStyleSizeInput("8".into()));
+        let _ = app.update(Message::PointStyleApplySize);
+        let _ = app.update(Message::CloseModal);
+
+        let header = &app.tabs[app.active_tab].scene.document.header;
+        assert_eq!(header.point_display_mode, 2);
+        assert_eq!(header.point_display_size, 3.0);
+    }
+
+    #[test]
+    fn invalid_point_size_is_reported_and_does_not_close_or_write() {
+        let mut app = open_with_values(2, 3.0);
+        let old_error_revision = app.command_line.error_revision;
+
+        let _ = app.update(Message::PointStyleSizeInput("abc".into()));
+        let _ = app.update(Message::PointStyleApplySize);
+
+        assert_eq!(
+            app.tabs[app.active_tab]
+                .scene
+                .document
+                .header
+                .point_display_size,
+            3.0
+        );
+        assert_eq!(app.active_modal, Some(ModalKind::PointStyle));
+        assert!(app.command_line.error_revision > old_error_revision);
+
+        let _ = app.update(Message::PointStyleOk);
+        assert_eq!(app.active_modal, Some(ModalKind::PointStyle));
+        assert_eq!(
+            app.tabs[app.active_tab]
+                .scene
+                .document
+                .header
+                .point_display_mode,
+            2
+        );
+    }
+
+    #[test]
+    fn accepting_point_style_commits_both_values_as_one_undo_step() {
+        let mut app = open_with_values(2, 3.0);
+        let i = app.active_tab;
+        let undo_depth = app.tabs[i].history.undo_stack.len();
+
+        let _ = app.update(Message::PointStyleSetMode(35));
+        let _ = app.update(Message::PointStyleSizeInput("8".into()));
+        let _ = app.update(Message::PointStyleOk);
+
+        let header = &app.tabs[i].scene.document.header;
+        assert_eq!(header.point_display_mode, 35);
+        assert_eq!(header.point_display_size, 8.0);
+        assert_eq!(app.tabs[i].history.undo_stack.len(), undo_depth + 1);
+        assert!(app.tabs[i].dirty);
+        assert_eq!(app.active_modal, None);
+    }
+
+    #[test]
+    fn accepting_relative_point_size_preserves_the_relative_sign() {
+        let mut app = open_with_values(2, 3.0);
+
+        let _ = app.update(Message::PointStyleSizeRelative(true));
+        let _ = app.update(Message::PointStyleSizeInput("5".into()));
+        let _ = app.update(Message::PointStyleOk);
+
+        assert_eq!(
+            app.tabs[app.active_tab]
+                .scene
+                .document
+                .header
+                .point_display_size,
+            -5.0
+        );
+    }
+}

src/app/update/viewport.rs

@@ -8,7 +8,7 @@ use crate::app::helpers::{
     polar_constrain_if_near, polar_constrain_near, ucs_rotate_vec, ucs_to_wcs, ucs_z_axis,
     CoordKind,
 };
-use crate::app::{Message, OpenCADStudio, POLY_START_DELAY_MS};
+use crate::app::{Message, ModalKind, OpenCADStudio, POLY_START_DELAY_MS};
 use crate::modules::ModuleEvent;
 use crate::scene::model::object::GripApply;
 use crate::scene::pick::grip::{
@@ -548,49 +548,102 @@ impl OpenCADStudio {
         Some(hit)
     }
 
-    /// Write PDSIZE from the dialog buffer with the current relative/absolute
-    /// sign. A relative size is stored negative; absolute positive. Switching to
-    /// absolute with an empty/zero size seeds a positive value from the current
-    /// on-screen size so the point stays representable (PDSIZE 0 always reads as
-    /// relative, so absolute needs a non-zero magnitude).
-    pub(in crate::app) fn apply_point_size(&mut self) {
+    /// Begin a staged Point Style edit. The active drawing is untouched until
+    /// the user accepts the dialog.
+    pub(in crate::app) fn begin_point_style_dialog(&mut self) {
         let i = self.active_tab;
-        let mut mag = self
+        let header = &self.tabs[i].scene.document.header;
+        let mode = header.point_display_mode;
+        let size = header.point_display_size;
+        self.point_style_tab_id = Some(self.tabs[i].id);
+        self.point_mode_buf = Some(mode);
+        self.point_size_relative = size <= 0.0;
+        self.point_size_buf = format!("{}", size.abs());
+        self.active_modal = Some(ModalKind::PointStyle);
+    }
+
+    /// Parse and validate the dialog's magnitude without changing the drawing.
+    pub(in crate::app) fn validate_point_size_input(&mut self) -> bool {
+        let valid = self
             .point_size_buf
             .trim()
             .parse::<f64>()
-            .unwrap_or(0.0)
-            .abs();
-        if !self.point_size_relative && mag == 0.0 {
+            .is_ok_and(f64::is_finite);
+        if !valid {
+            self.command_line
+                .push_error(crate::t!("Point size must be a valid finite number.").as_ref());
+        }
+        valid
+    }
+
+    /// Commit the staged glyph and size together as one drawing undo step.
+    /// Returns false on invalid text so OK can leave the dialog open for repair.
+    pub(in crate::app) fn commit_point_style_dialog(&mut self) -> bool {
+        let Some(magnitude) = self
+            .point_size_buf
+            .trim()
+            .parse::<f64>()
+            .ok()
+            .filter(|value| value.is_finite())
+            .map(f64::abs)
+        else {
+            self.command_line
+                .push_error(crate::t!("Point size must be a valid finite number.").as_ref());
+            return false;
+        };
+        let Some(tab_id) = self.point_style_tab_id else {
+            return false;
+        };
+        let Some(i) = self.tabs.iter().position(|tab| tab.id == tab_id) else {
+            self.command_line
+                .push_error(crate::t!("The drawing for Point Style is no longer open.").as_ref());
+            return false;
+        };
+
+        let mut magnitude = magnitude;
+        if !self.point_size_relative && magnitude == 0.0 {
             let wpp = self.tabs[i].scene.world_per_pixel().unwrap_or(0.0);
             let viewport_height = self.tabs[i].scene.selection.borrow().view.vp_size.1;
-            mag = if wpp > 0.0 {
+            magnitude = if wpp > 0.0 {
                 crate::entities::point::relative_world_size(0.0, wpp, viewport_height)
             } else {
                 1.0
             };
-            self.point_size_buf = format!("{mag:.4}");
+            self.point_size_buf = format!("{magnitude:.4}");
         }
-        let next = if self.point_size_relative { -mag } else { mag };
-        self.push_undo_snapshot(i, "PDSIZE");
-        self.tabs[i].scene.document.header.point_display_size = next;
+        let next_size = if self.point_size_relative {
+            -magnitude
+        } else {
+            magnitude
+        };
+        let next_mode = self
+            .point_mode_buf
+            .unwrap_or(self.tabs[i].scene.document.header.point_display_mode);
+        let header = &self.tabs[i].scene.document.header;
+        if header.point_display_mode == next_mode && header.point_display_size == next_size {
+            return true;
+        }
+
+        self.push_undo_snapshot(i, "DDPTYPE");
+        let header = &mut self.tabs[i].scene.document.header;
+        header.point_display_mode = next_mode;
+        header.point_display_size = next_size;
         self.tabs[i].scene.invalidate_point_dependencies();
         self.tabs[i].dirty = true;
+        true
     }
 
-    /// Replace the `mask` bits of PDMODE with `value`, rebuild the point glyphs
-    /// and mark the document dirty. Used by the Point Style (DDPTYPE) dialog.
+    /// Stage a replacement for the `mask` bits of PDMODE from the Point Style
+    /// (DDPTYPE) dialog. The drawing is changed only when OK commits the stage.
     pub(in crate::app) fn set_point_mode_bits(&mut self, mask: i16, value: i16) {
-        let i = self.active_tab;
-        let cur = self.tabs[i].scene.document.header.point_display_mode;
-        let next = (cur & !mask) | (value & mask);
-        if next == cur {
+        if self.point_style_tab_id.is_none() {
             return;
         }
-        self.push_undo_snapshot(i, "PDMODE");
-        self.tabs[i].scene.document.header.point_display_mode = next;
-        self.tabs[i].scene.invalidate_point_dependencies();
-        self.tabs[i].dirty = true;
+        let Some(cur) = self.point_mode_buf else {
+            return;
+        };
+        let next = (cur & !mask) | (value & mask);
+        self.point_mode_buf = Some(next);
     }
 
     /// Mirror the live grid display + grid-snap toggles onto tab `i`'s active

src/app/view/modal.rs

@@ -1847,11 +1847,13 @@ impl OpenCADStudio {
             }
             super::super::ModalKind::PointStyle => sized_flow(ex, 360, 470, |flow| {
                 crate::ui::style::point_style::view_window(
-                    self.tabs[self.active_tab]
-                        .scene
-                        .document
-                        .header
-                        .point_display_mode,
+                    self.point_mode_buf.unwrap_or_else(|| {
+                        self.tabs[self.active_tab]
+                            .scene
+                            .document
+                            .header
+                            .point_display_mode
+                    }),
                     self.point_size_relative,
                     &self.point_size_buf,
                     flow,

src/ui/style/point_style.rs

@@ -194,7 +194,13 @@ pub fn view_window<'a>(
     ]
     .spacing(6);
 
-    let ok = dialog_button(t!("OK"), Message::PointStyleOk, true);
+    let actions = row![
+        Space::new().width(width),
+        dialog_button(t!("OK"), Message::PointStyleOk, true),
+        dialog_button(t!("Cancel"), Message::CloseModal, false),
+    ]
+    .spacing(8)
+    .align_y(iced::Center);
 
     container(
         column![
@@ -206,7 +212,7 @@ pub fn view_window<'a>(
             Space::new().height(8),
             radios,
             Space::new().height(12),
-            row![Space::new().width(width), ok].width(width),
+            actions.width(width),
         ]
         .spacing(4)
         .padding(20)