Improve scratch window behaviours (for mouse-dragging windows and new windows when a scratch window is selected) (#718)

This PR changes several widow behaviours related to scratch windows. It
seeks to make scratch windows more predictable (in how one scratches a
window) and try to minimise instances of "accidentally/unexpectedly"
scratching windows.

Users (especially new users) seem to struggle with some of the
behaviours for scratch windows.

See some example comments here:

- #680 (comment)
- #700 (comment)
- #700 (comment)

On review, a couple of behaviours are rather unintuitive with scratch
windows:

1. when a scratch window is selected, any new window opened will also be
scratched. I understand the thought here, but this is rarely what's
wanted (for me anyway) and often leads to confusion. This PR undoes
this. New windows will be tiled (regardless of whether a scratch window
is currently selected).

2. Dragging a window (with mouse) and NOT dropping on a target now
re-tiles that window (previously it scratched that window). I've had two
user reports in the last few weeks of this (reported as a bug). In any
case, it seems the more intuitive option of for that window to be
re-tiled:


https://github.com/paperwm/PaperWM/assets/30424662/9c4a20d6-52e3-408f-9c0a-62ee0ceb6244

Author: jtaala

README.md

@@ -164,8 +164,6 @@ PaperWM currently works best using the workspaces span monitors preference, this
 The scratch layer is an escape hatch to a familiar floating layout. This layer is intended to store windows that are globally useful like chat applications and in general serve as the kitchen sink.
 When the scratch layer is active it will float above the tiled windows, when hidden the windows will be minimized.
 
-Opening a window when the scratch layer is active will make it float automatically.
-
 Pressing <kbd>Super</kbd><kbd>Escape</kbd> toggles between showing and hiding the windows in the scratch layer.
 Activating windows in the scratch layer is done using <kbd>Super</kbd><kbd>Tab</kbd>, the floating windows having priority in the list while active.
 When the tiling is active <kbd>Super</kbd><kbd>Shift</kbd><kbd>Tab</kbd> selects the most recently used scratch window.

grab.js

@@ -101,8 +101,10 @@ export class MoveGrab {
     }
 
     beginDnD({ center } = {}) {
-        if (this.dnd)
+        if (this.dnd) {
             return;
+        }
+
         this.center = center;
         this.dnd = true;
         console.debug("#grab", "begin DnD");
@@ -241,6 +243,7 @@ export class MoveGrab {
             if (x < colX)
                 continue;
 
+            // vertically tiled
             for (let i = 0; i < column.length + 1; i++) {
                 let clone;
                 if (i < column.length) {
@@ -278,19 +281,20 @@ export class MoveGrab {
             }
         }
 
-        function sameTarget(a, b) {
+        const sameTarget = (a, b) => {
             if (a === b)
                 return true;
             if (!a || !b)
                 return false;
             return a.space === b.space && a.position[0] === b.position[0] && a.position[1] === b.position[1];
-        }
+        };
 
-        // TODO: rename dndTarget to selectedZone ?
         if (!sameTarget(target, this.dndTarget)) {
-            this.dndTarget && this.deactivateDndTarget(this.dndTarget);
-            if (target)
+            // deactivate only if target exists
+            if (target) {
+                this.deactivateDndTarget(this.dndTarget);
                 this.activateDndTarget(target, initial);
+            }
         }
     }
 
@@ -406,7 +410,8 @@ export class MoveGrab {
                 Tiling.ensureViewport(metaWindow, space);
 
                 Utils.actor_raise(clone);
-            } else {
+            }
+            else {
                 metaWindow.move_frame(true, clone.x, clone.y);
                 Scratch.makeScratch(metaWindow);
                 this.initialSpace.moveDone();
@@ -418,14 +423,22 @@ export class MoveGrab {
                 clone.set_scale(1, 1);
                 clone.set_pivot_point(0, 0);
 
-                params.onStopped = () => {
-                    actor.set_pivot_point(0, 0);
+                const halftime = 0.5 * Settings.prefs.animation_time;
+                params.time = halftime;
+                params.onComplete = () => {
+                    Easer.addEase(actor, {
+                        time: halftime,
+                        onComplete: () => {
+                            Scratch.unmakeScratch(metaWindow);
+                        },
+                    });
                 };
                 Easer.addEase(actor, params);
             }
 
             Navigator.getNavigator().accept();
-        } else if (this.initialSpace.indexOf(metaWindow) !== -1) {
+        }
+        else if (this.initialSpace.indexOf(metaWindow) !== -1) {
             let space = this.initialSpace;
             space.targetX = space.cloneContainer.x;
 
@@ -486,24 +499,26 @@ export class MoveGrab {
     }
 
     activateDndTarget(zone, first) {
-        function mkZoneActor(props) {
+        const mkZoneActor = props => {
             let actor = new St.Widget({ style_class: "tile-preview" });
             actor.x = props.x ?? 0;
             actor.y = props.y ?? 0;
             actor.width = props.width ?? 0;
             actor.height = props.height ?? 0;
             return actor;
-        }
+        };
 
         zone.actor = mkZoneActor({ ...zone.actorParams });
 
         this.dndTarget = zone;
         this.zoneActors.add(zone.actor);
+        const raise = () => Utils.actor_raise(zone.actor);
 
         let params = {
             time: Settings.prefs.animation_time,
             [zone.originProp]: zone.center - zone.marginA,
             [zone.sizeProp]: zone.marginA + zone.marginB,
+            onComplete: raise,
         };
 
         if (first) {
@@ -523,7 +538,7 @@ export class MoveGrab {
         zone.space.cloneContainer.add_child(zone.actor);
         zone.space.selection.hide();
         zone.actor.show();
-        Utils.actor_raise(zone.actor);
+        raise();
         Easer.addEase(zone.actor, params);
     }
 

tiling.js

@@ -3282,12 +3282,7 @@ export function insertWindow(metaWindow, { existing }) {
             focusWindow = mru[1];
         }
 
-        // Scratch if have scratch windows on this space and focused window is also scratch
-        let scratchIsFocused =
-            Scratch.getScratchWindows().length > 0 &&
-            space === spaces.spaceOfWindow(focusWindow) &&
-            Scratch.isScratchWindow(focusWindow);
-        let addToScratch = scratchIsFocused;
+        let addToScratch = false;
 
         let winprop = Settings.find_winprop(metaWindow);
         if (winprop) {
@@ -3309,9 +3304,7 @@ export function insertWindow(metaWindow, { existing }) {
         if (addToScratch) {
             connectSizeChanged();
             Scratch.makeScratch(metaWindow);
-            if (scratchIsFocused) {
-                activateWindowAfterRendered(actor, metaWindow);
-            }
+            activateWindowAfterRendered(actor, metaWindow);
             return;
         }
     }