From e00f68a93e6e9eeba89f75b78aca6af82afb25a2 Mon Sep 17 00:00:00 2001
From: maubrickastuto <maubrickkhianastuto@gmail.com>
Date: Wed, 23 Sep 2026 21:50:40 +0800
Subject: [PATCH] fix: resolve GitHub issues #184, #109, #139, #160, #100

- feat(project): add 1440p (QHD / 2560x1440) support across launcher, monitor, and project dialog (#184)
- fix(export): match project aspect ratio and dynamic resolution options in export dialog (#109)
- fix(inspector): eliminate text typing lag, cursor jump, and click-outside reversion race (#139)
- fix(timeline): clean up orphaned transitions and ghost seam artifacts on split/delete (#160)
- fix(shell): configure Wayland app_id, StartupWMClass, and window icon for Linux dock/taskbar (#100)
---
 .github/workflows/build-app.yml               |  1 +
 flake.nix                                     |  1 +
 .../concat-project/src/commands/clips.rs      | 26 +++++++
 src/crates/concat-project/src/lib.rs          | 75 +++++++++++++++++++
 src/crates/concat/src/lib.rs                  |  1 +
 src/crates/concat/src/panes/export.rs         | 39 ++++++++++
 src/crates/concat/src/platform.rs             |  9 ++-
 src/crates/concat/src/studio.rs               | 18 ++++-
 src/crates/concat/ui/app.slint                |  1 +
 src/crates/concat/ui/dialogs/export.slint     |  3 +-
 src/crates/concat/ui/dialogs/project.slint    |  4 +-
 .../concat/ui/inspector/text-panel.slint      |  7 +-
 src/crates/concat/ui/timeline/lanes.slint     |  9 +++
 .../concat/ui/workspace/preview-pane.slint    |  6 +-
 14 files changed, 187 insertions(+), 13 deletions(-)

diff --git a/.github/workflows/build-app.yml b/.github/workflows/build-app.yml
index 052643d6..8195cae5 100644
--- a/.github/workflows/build-app.yml
+++ b/.github/workflows/build-app.yml
@@ -530,6 +530,7 @@ jobs:
           Comment=Video editor
           Exec=concat
           Icon=concat
+          StartupWMClass=concat
           Categories=AudioVideo;Video;
           Terminal=false
           DESKTOP
diff --git a/flake.nix b/flake.nix
index 138e3d0b..2af75894 100644
--- a/flake.nix
+++ b/flake.nix
@@ -156,6 +156,7 @@
                 "AudioVideo"
                 "AudioVideoEditing"
               ];
+              startupWMClass = "concat";
             })
           ];
 
diff --git a/src/crates/concat-project/src/commands/clips.rs b/src/crates/concat-project/src/commands/clips.rs
index 5051cd60..6a5fe748 100644
--- a/src/crates/concat-project/src/commands/clips.rs
+++ b/src/crates/concat-project/src/commands/clips.rs
@@ -308,6 +308,11 @@ pub(super) fn apply(
                 head.fade_out = 0.0;
                 head.animation_out = None;
                 head.rewindow_keys(whole, 0.0, offset);
+                if offset < 0.05 {
+                    head.transition_in = None;
+                } else if let Some(t) = head.transition_in.as_mut() {
+                    t.duration = t.duration.min(offset);
+                }
                 timeline.clips.insert(index + 1, Arc::new(tail));
             }
             // A split always mints the tail, so "minted anything" and
@@ -565,6 +570,27 @@ pub(super) fn apply(
             timeline
                 .clips
                 .retain(|clip| !doomed.contains(clip.id.as_str()));
+            let orphaned: Vec<usize> = timeline
+                .clips
+                .iter()
+                .enumerate()
+                .filter_map(|(i, clip)| {
+                    if clip.transition_in.is_some() {
+                        let has_preceding = timeline.clips.iter().any(|c| {
+                            c.track_id == clip.track_id
+                                && c.id != clip.id
+                                && (c.start + c.duration - clip.start).abs() < 1e-4
+                        });
+                        if !has_preceding {
+                            return Some(i);
+                        }
+                    }
+                    None
+                })
+                .collect();
+            for i in orphaned {
+                timeline.clip_at_mut(i).transition_in = None;
+            }
             let applied = timeline.clips.len() != clip_count;
             if ripple && applied {
                 close_gaps(timeline, &removed);
diff --git a/src/crates/concat-project/src/lib.rs b/src/crates/concat-project/src/lib.rs
index 0351db5c..b02a580e 100644
--- a/src/crates/concat-project/src/lib.rs
+++ b/src/crates/concat-project/src/lib.rs
@@ -3627,4 +3627,79 @@ mod tests {
         let missing = project.missing_media();
         assert_eq!(missing.len(), 0);
     }
+
+    #[test]
+    fn remove_preceding_clip_clears_transition_in() {
+        let (mut editor, media_id, clip1_id) = fixture();
+        let track_id = editor.project().active().tracks[0].id.clone();
+        let clip2_id = editor
+            .apply(Command::AddClip {
+                media_id,
+                track_id,
+                start: 10.0,
+                ripple: false,
+            })
+            .expect("adds clip2")
+            .created_id
+            .expect("id");
+        editor
+            .apply(Command::UpdateClip {
+                clip_id: clip2_id.clone(),
+                patch: ClipPatch {
+                    transition_in: Some(Some(crate::model::Transition {
+                        id: "cross-fade".to_owned(),
+                        duration: 1.0,
+                    })),
+                    ..Default::default()
+                },
+            })
+            .expect("adds transition");
+        let clip2 = editor.project().active().clip(&clip2_id).unwrap();
+        assert!(clip2.transition_in.is_some());
+
+        editor
+            .apply(Command::RemoveClips {
+                clip_ids: vec![clip1_id],
+                ripple: false,
+            })
+            .expect("removes clip1");
+
+        let clip2 = editor.project().active().clip(&clip2_id).unwrap();
+        assert_eq!(clip2.transition_in, None);
+    }
+
+    #[test]
+    fn split_clip_clamps_or_removes_transition_in() {
+        let (mut editor, _, clip_id) = fixture();
+        editor
+            .apply(Command::UpdateClip {
+                clip_id: clip_id.clone(),
+                patch: ClipPatch {
+                    transition_in: Some(Some(crate::model::Transition {
+                        id: "cross-fade".to_owned(),
+                        duration: 2.0,
+                    })),
+                    ..Default::default()
+                },
+            })
+            .expect("adds transition");
+
+        editor
+            .apply(Command::SplitClips {
+                clip_ids: vec![clip_id.clone()],
+                time: 1.0,
+            })
+            .expect("splits");
+        let head = editor.project().active().clip(&clip_id).unwrap();
+        assert_eq!(head.transition_in.as_ref().map(|t| t.duration), Some(1.0));
+
+        editor
+            .apply(Command::SplitClips {
+                clip_ids: vec![clip_id.clone()],
+                time: 0.03,
+            })
+            .expect("splits again");
+        let head2 = editor.project().active().clip(&clip_id).unwrap();
+        assert_eq!(head2.transition_in, None);
+    }
 }
diff --git a/src/crates/concat/src/lib.rs b/src/crates/concat/src/lib.rs
index 4128df1e..55e87e76 100644
--- a/src/crates/concat/src/lib.rs
+++ b/src/crates/concat/src/lib.rs
@@ -755,6 +755,7 @@ pub fn run() -> Result<(), slint::PlatformError> {
     }));
     editor.on_band_selected(on_lanes!(
         |state, from: f32, to: f32, from_y: f32, to_y: f32, additive: bool| {
+            state.flush_commit();
             let (from_row, to_row) = (state.row_at(from_y), state.row_at(to_y));
             let caught: Vec<String> = state
                 .timeline()
diff --git a/src/crates/concat/src/panes/export.rs b/src/crates/concat/src/panes/export.rs
index c874fd1f..4a78abf6 100644
--- a/src/crates/concat/src/panes/export.rs
+++ b/src/crates/concat/src/panes/export.rs
@@ -16,6 +16,8 @@
 use concat_host::export::{self, ExportSpec};
 use concat_media::ColorRange;
 
+use slint::VecModel;
+
 use crate::format::{bytes, eta};
 use crate::host::{on_ui, spawn};
 use crate::i18n::{self, t, tf};
@@ -134,6 +136,28 @@ impl ExportPane {
                 self.open = true;
                 self.phase = ExportPhase::Idle;
                 self.message.clear();
+                if self.name.is_empty() || self.name == "Untitled" {
+                    self.name = studio.project_name.clone();
+                }
+                let (proj_w, proj_h) = studio.output_size();
+                let short_side = proj_w.min(proj_h);
+                if let Some((idx, _)) = EXPORT_SHORT_SIDES
+                    .iter()
+                    .enumerate()
+                    .min_by_key(|(_, side)| (**side as i64 - short_side as i64).abs())
+                {
+                    self.resolution = idx;
+                }
+                let rate = studio.project().active().video.rate();
+                if let Some((idx, _)) =
+                    EXPORT_RATES.iter().enumerate().min_by(|(_, r1), (_, r2)| {
+                        let diff1 = (r1.0 as f64 / r1.1 as f64 - rate).abs();
+                        let diff2 = (r2.0 as f64 / r2.1 as f64 - rate).abs();
+                        diff1.total_cmp(&diff2)
+                    })
+                {
+                    self.rate = idx;
+                }
             }
             ExportMsg::Close => self.open = false,
             ExportMsg::NameEdited(name) => self.name = name,
@@ -354,6 +378,20 @@ impl ExportPane {
             .iter()
             .filter(|clip| clip.kind == concat_project::model::ClipKind::Text)
             .count();
+        let (proj_w, proj_h) = studio.output_size();
+        let (proj_w, proj_h) = (proj_w.max(1) as f64, proj_h.max(1) as f64);
+        let even = |side: f64| ((side / 2.0).round() as u32 * 2).max(2);
+        let resolution_options: Vec<slint::SharedString> = EXPORT_SHORT_SIDES
+            .iter()
+            .map(|&short| {
+                let (w, h) = if proj_w >= proj_h {
+                    (even(short as f64 * proj_w / proj_h), short)
+                } else {
+                    (short, even(short as f64 * proj_h / proj_w))
+                };
+                slint::SharedString::from(format!("{w} × {h}"))
+            })
+            .collect();
         ExportData {
             open: self.open,
             name: self.name.as_str().into(),
@@ -370,6 +408,7 @@ impl ExportPane {
             }
             .into(),
             resolution: self.resolution as i32,
+            resolution_options: slint::ModelRc::new(VecModel::from(resolution_options)),
             rate: self.rate as i32,
             quality: self.quality as i32,
             codec: self.codec as i32,
diff --git a/src/crates/concat/src/platform.rs b/src/crates/concat/src/platform.rs
index 43ff9084..57a6e5e9 100644
--- a/src/crates/concat/src/platform.rs
+++ b/src/crates/concat/src/platform.rs
@@ -185,8 +185,13 @@ pub fn select_backend(
     }
     #[cfg(not(any(target_os = "macos", target_os = "windows", target_os = "android")))]
     {
-        selector = selector
-            .with_winit_window_attributes_hook(|attributes| attributes.with_decorations(false));
+        use slint::winit_030::winit::platform::wayland::WindowAttributesExtWayland;
+        use slint::winit_030::winit::platform::x11::WindowAttributesExtX11;
+        selector = selector.with_winit_window_attributes_hook(|attributes| {
+            attributes
+                .with_decorations(false)
+                .with_name("concat", "concat")
+        });
     }
     selector.select()?;
     Ok(gpu)
diff --git a/src/crates/concat/src/studio.rs b/src/crates/concat/src/studio.rs
index 08230730..745bab71 100644
--- a/src/crates/concat/src/studio.rs
+++ b/src/crates/concat/src/studio.rs
@@ -63,8 +63,9 @@ use crate::presets::{self, TextPreset};
 use crate::ui::*;
 
 /// The monitor's output sizes, matching the picker's rows.
-pub const OUTPUTS: [(i32, i32); 6] = [
+pub const OUTPUTS: [(i32, i32); 7] = [
     (1920, 1080),
+    (2560, 1440),
     (3840, 2160),
     (1080, 1920),
     (1080, 1080),
@@ -181,7 +182,12 @@ pub const ASPECTS: [(&str, u32, u32); 4] = [
 /// and 1080p vertical is 1080 x 1920, the same number of lines either way.
 /// Naming the long edge instead would make a vertical 1080p a 1080 x 1920
 /// frame at one moment and a 608 x 1080 frame at another.
-pub const SIZES: [(&str, u32); 3] = [("720p", 720), ("1080p", 1080), ("4K", 2160)];
+pub const SIZES: [(&str, u32); 4] = [
+    ("720p", 720),
+    ("1080p", 1080),
+    ("1440p", 1440),
+    ("4K", 2160),
+];
 
 /// The frame an aspect and a size name, in pixels.
 ///
@@ -674,6 +680,7 @@ pub struct Studio {
     /// on every move, and each commit was a command, an undo of the last,
     /// a rebuild of the mix and a full publish. The commit is held until
     /// the moves pause; the echo shows the value meanwhile.
+    pub commit_target: Option<String>,
     commit_pending: bool,
     commit_timer: slint::Timer,
     /// What the catalogue shelves were last built from; while nothing in
@@ -1354,6 +1361,7 @@ impl Studio {
             audition: None,
             revision: 0,
             flat: None,
+            commit_target: None,
             commit_pending: false,
             commit_timer: slint::Timer::default(),
             shelf_stamp: std::cell::RefCell::new(None),
@@ -3236,6 +3244,7 @@ impl Studio {
         let Some(id) = self.sole_selection() else {
             return;
         };
+        self.commit_target = Some(id.clone());
         // The media's tracks, read before the echo is borrowed: a row of
         // the Audio panel's list is a stream index of the file.
         let audio_tracks: Vec<u32> = if field == ClipField::AudioTrack {
@@ -3423,6 +3432,7 @@ impl Studio {
         let Some(id) = self.sole_selection() else {
             return;
         };
+        self.commit_target = Some(id.clone());
         self.begin_echo();
         let Some(clip) = self.echo_clip_mut(&id) else {
             return;
@@ -3513,7 +3523,8 @@ impl Studio {
     }
 
     fn commit_now(&mut self) {
-        let Some(id) = self.sole_selection() else {
+        let target_id = self.commit_target.take().or_else(|| self.sole_selection());
+        let Some(id) = target_id else {
             self.echo = None;
             return;
         };
@@ -5606,6 +5617,7 @@ impl Studio {
                         transition_duration: clip
                             .transition_in
                             .as_ref()
+                            .filter(|_| self.outgoing_of(clip).is_some())
                             .map(|transition| transition.duration as f32)
                             .unwrap_or(0.0),
                         fade_in: clip.fade_in as f32,
diff --git a/src/crates/concat/ui/app.slint b/src/crates/concat/ui/app.slint
index 25edaa51..8853c401 100644
--- a/src/crates/concat/ui/app.slint
+++ b/src/crates/concat/ui/app.slint
@@ -60,6 +60,7 @@ export {
 
 export component App inherits Window {
     title: "Concat";
+    icon: @image-url("../../../../assets/icons/concat_logo_256.png");
     // Where the strip carries its own window buttons the platform's
     // decorations are not wanted, and this is the property Slint keeps
     // them off with: the winit backend re-applies `no-frame` to the
diff --git a/src/crates/concat/ui/dialogs/export.slint b/src/crates/concat/ui/dialogs/export.slint
index 1ec09b3a..adc09022 100644
--- a/src/crates/concat/ui/dialogs/export.slint
+++ b/src/crates/concat/ui/dialogs/export.slint
@@ -29,6 +29,7 @@ export struct ExportData {
     /// "8 clips · 3 titles"
     contents: string,
     resolution: int,
+    resolution-options: [string],
     rate: int,
     quality: int,
     /// index into the codec list: H.264, HEVC, AV1
@@ -244,7 +245,7 @@ export component ExportDialog inherits Modal {
                 label: I18n.t("Resolution");
                 Select {
                     current: root.data.resolution;
-                    options: ["3840 × 2160", "2560 × 1440", "1920 × 1080", "1280 × 720"];
+                    options: root.data.resolution-options.length > 0 ? root.data.resolution-options : ["3840 × 2160", "2560 × 1440", "1920 × 1080", "1280 × 720"];
                     details: ["4K", "QHD", "1080p", "720p"];
                     changed(index) => { root.resolution-changed(index); }
                 }
diff --git a/src/crates/concat/ui/dialogs/project.slint b/src/crates/concat/ui/dialogs/project.slint
index b5d3a08a..1f501f94 100644
--- a/src/crates/concat/ui/dialogs/project.slint
+++ b/src/crates/concat/ui/dialogs/project.slint
@@ -77,9 +77,9 @@ export component ProjectDialog inherits Modal {
                 Select {
                     current: root.data.size;
                     placeholder: I18n.t("Custom");
-                    options: ["1920 × 1080", "3840 × 2160", "1080 × 1920",
+                    options: ["1920 × 1080", "2560 × 1440", "3840 × 2160", "1080 × 1920",
                         "1080 × 1080", "1440 × 1080", "2560 × 1080"];
-                    details: ["16:9", "16:9 4K", "9:16", "1:1", "4:3", "21:9"];
+                    details: ["16:9", "16:9 QHD", "16:9 4K", "9:16", "1:1", "4:3", "21:9"];
                     changed(index) => { root.size-changed(index); }
                 }
             }
diff --git a/src/crates/concat/ui/inspector/text-panel.slint b/src/crates/concat/ui/inspector/text-panel.slint
index 5231a4ef..5422c41b 100644
--- a/src/crates/concat/ui/inspector/text-panel.slint
+++ b/src/crates/concat/ui/inspector/text-panel.slint
@@ -55,6 +55,7 @@ export component TextPanel inherits VerticalLayout {
     property <float> offset-y;
     property <int> weight-index;
     property <int> family-index;
+    property <string> content;
 
     property <[float]> weights: [400, 500, 600, 700];
     /// The label column of the rows whose label is two words.
@@ -63,6 +64,7 @@ export component TextPanel inherits VerticalLayout {
     property <float> frame-h: Math.max(1, root.selected.frame-height);
 
     function seed() {
+        root.content = root.selected.content;
         root.size = root.selected.font-size;
         root.alpha = root.selected.text-opacity;
         root.stroke-width = root.selected.stroke-width;
@@ -116,7 +118,7 @@ export component TextPanel inherits VerticalLayout {
                     y: 6px;
                     width: parent.width - 16px;
                     height: parent.height - 12px;
-                    text: root.selected.content;
+                    text: root.content;
                     color: Theme.fg;
                     font-size: Theme.fs;
                     // Multi-line: a lower third is routinely two lines, and a
@@ -131,11 +133,12 @@ export component TextPanel inherits VerticalLayout {
                     // way out, so a title being typed is one change and not
                     // forty.
                     edited => {
+                        root.content = self.text;
                         root.set-text(ClipTextField.content, self.text);
                     }
                     changed has-focus => {
                         if (!self.has-focus) {
-                            root.set-text(ClipTextField.content, self.text);
+                            root.set-text(ClipTextField.content, root.content);
                             root.commit();
                         }
                     }
diff --git a/src/crates/concat/ui/timeline/lanes.slint b/src/crates/concat/ui/timeline/lanes.slint
index f2ab6db5..f9c00251 100644
--- a/src/crates/concat/ui/timeline/lanes.slint
+++ b/src/crates/concat/ui/timeline/lanes.slint
@@ -183,6 +183,15 @@ component Clip inherits Rectangle {
     property <bool> right-handle-hover: false;
     property <bool> right-handle-drag: false;
 
+    changed item => {
+        root.trans-btn-hover = false;
+        root.trans-btn-drag = false;
+        root.left-handle-hover = false;
+        root.left-handle-drag = false;
+        root.right-handle-hover = false;
+        root.right-handle-drag = false;
+    }
+
     property <bool> show-tooltip: root.has-transition
         && (root.trans-btn-hover || root.trans-btn-drag
             || root.right-handle-hover || root.right-handle-drag
diff --git a/src/crates/concat/ui/workspace/preview-pane.slint b/src/crates/concat/ui/workspace/preview-pane.slint
index f95b934b..e4774c7a 100644
--- a/src/crates/concat/ui/workspace/preview-pane.slint
+++ b/src/crates/concat/ui/workspace/preview-pane.slint
@@ -657,9 +657,9 @@ export component PreviewPane inherits Rectangle {
     /// That row was used.
     callback pane-removed();
 
-    property <[int]> ratios-w: [1920, 3840, 1080, 1080, 1440, 2560];
-    property <[int]> ratios-h: [1080, 2160, 1920, 1080, 1080, 1080];
-    property <[string]> ratio-names: ["16:9", "16:9 4K", "9:16", "1:1", "4:3", "21:9"];
+    property <[int]> ratios-w: [1920, 2560, 3840, 1080, 1080, 1440, 2560];
+    property <[int]> ratios-h: [1080, 1440, 2160, 1920, 1080, 1080, 1080];
+    property <[string]> ratio-names: ["16:9", "16:9 QHD", "16:9 4K", "9:16", "1:1", "4:3", "21:9"];
 
     property <float> aspect: root.output-height > 0
         ? root.output-width / root.output-height : 16 / 9;