fix: complete task tokens on trailing whitespace

Sources/Conjure/NotesTextView.swift

@@ -5,7 +5,7 @@ private let sourceTaskAttachment = NSAttributedString.Key("Conjure.sourceTaskAtt
 
 private final class TaskAttachment: NSTextAttachment {
     let marker: String
-    var checked: Bool { !marker.hasSuffix("[ ]") }
+    var checked: Bool { marker.hasSuffix("[x]") || marker.hasSuffix("[X]") }
 
     @MainActor
     init(marker: String) {
@@ -27,7 +27,7 @@ private final class TaskAttachmentCell: NSTextAttachmentCell {
 @MainActor
 final class NotesTextView: NSTextView {
     private static let taskPattern = try! NSRegularExpression(
-        pattern: "(?m)^[ \\t]*((?:[-+*]|[0-9]+[.)])[ \\t]+\\[([ xX])\\])(?=[ \\t]|\\r?$)"
+        pattern: "(?m)^[ \\t]*((?:[-+*]|[0-9]+[.)])[ \\t]+\\[([ xX]?)\\])(?=[ \\t])"
     )
     private var tasks: [(range: NSRange, attachment: TaskAttachment)] = []
     private var checkboxes: [NSButton] = []
@@ -321,8 +321,10 @@ final class NotesTextView: NSTextView {
         let selection = selectedRange()
         let marker = task.attachment.marker as NSString
         let range = markdownRange(for: task.range)
+        let opening = marker.range(of: "[", options: .backwards).location
         replaceMarkdown(task.attachment.checked ? " " : "x",
-                        range: NSRange(location: range.location + marker.length - 2, length: 1))
+                        range: NSRange(location: range.location + opening + 1,
+                                       length: marker.length - opening - 2))
         setSelectedRange(selection)
     }
 }