Further simplify custom streams UI to prevent jank

Editing URLs and stream kind after the fact doesn't update properly, and
can lead to janky behavior when the URL duplicates another stream,
because the stream datas get merged together and the row disappears.
Moving to larger more atomic editing operations removes these corner
cases.

src/web/control.js

@@ -465,21 +465,22 @@ function App({ wsEndpoint, role }) {
     [gridCount, sharedState, focusedInputIdx],
   )
 
-  const handleChangeCustomStream = useCallback((origLink, customStream) => {
-    if (!customStream.label && !customStream.link) {
-      send({
-        type: 'delete-custom-stream',
-        url: origLink,
-      })
-      return
-    }
+  const handleChangeCustomStream = useCallback((url, customStream) => {
     send({
       type: 'update-custom-stream',
-      url: origLink,
+      url,
       data: customStream,
     })
   })
 
+  const handleDeleteCustomStream = useCallback((url) => {
+    send({
+      type: 'delete-custom-stream',
+      url,
+    })
+    return
+  })
+
   const setStreamCensored = useCallback((isCensored) => {
     send({
       type: 'set-stream-censored',
@@ -730,15 +731,14 @@ function App({ wsEndpoint, role }) {
                   We need it to be part of the array (rather than JSX below) for DOM diffing to match the key and retain focus.
                 */}
                 {customStreams.map(({ link, label, kind }, idx) => (
-                  <div>
-                    <CustomStreamInput
-                      key={idx}
-                      link={link}
-                      label={label}
-                      kind={kind}
-                      onChange={handleChangeCustomStream}
-                    />
-                  </div>
+                  <CustomStreamInput
+                    key={idx}
+                    link={link}
+                    label={label}
+                    kind={kind}
+                    onChange={handleChangeCustomStream}
+                    onDelete={handleDeleteCustomStream}
+                  />
                 ))}
                 <CreateCustomStreamInput onCreate={handleChangeCustomStream} />
               </div>
@@ -1110,64 +1110,62 @@ function GridControls({
   )
 }
 
-function CustomStreamInput({ onChange, ...props }) {
-  const handleChangeLink = useCallback(
-    (value) => {
-      onChange(props.link, { ...props, link: value })
-    },
-    [onChange, props.link],
-  )
+function CustomStreamInput({ onChange, onDelete, ...props }) {
   const handleChangeLabel = useCallback(
     (value) => {
       onChange(props.link, { ...props, label: value })
     },
-    [onChange, props.link],
-  )
-  const handleChangeKind = useCallback(
-    (ev) => {
-      onChange(props.link, { ...props, kind: ev.target.value })
-    },
-    [onChange, props.link],
+    [onChange, props],
   )
+  const handleDeleteClick = useCallback(() => {
+    onDelete(props.link)
+  }, [onDelete, props.link])
   return (
-    <>
-      <LazyChangeInput
-        onChange={handleChangeLink}
-        placeholder="https://..."
-        value={props.link}
-      />
+    <div>
       <LazyChangeInput
+        value={props.label}
         onChange={handleChangeLabel}
         placeholder="Label (optional)"
-        value={props.label}
+      />{' '}
+      <a href={props.link}>{props.link}</a> <span>({props.kind})</span>{' '}
+      <button onClick={handleDeleteClick}>x</button>
+    </div>
+  )
+}
+
+function CreateCustomStreamInput({ onCreate }) {
+  const [link, setLink] = useState('')
+  const [kind, setKind] = useState('video')
+  const [label, setLabel] = useState('')
+  const handleSubmit = useCallback(
+    (ev) => {
+      ev.preventDefault()
+      onCreate(link, { link, kind, label })
+      setLink('')
+      setKind('video')
+      setLabel('')
+    },
+    [onCreate, link, kind, label],
+  )
+  return (
+    <form onSubmit={handleSubmit}>
+      <input
+        value={link}
+        onChange={(ev) => setLink(ev.target.value)}
+        placeholder="https://..."
       />
-      <select onChange={handleChangeKind} value={props.kind}>
+      <select onChange={(ev) => setKind(ev.target.value)} value={kind}>
         <option value="video">video</option>
         <option value="audio">audio</option>
         <option value="web">web</option>
         <option value="overlay">overlay</option>
         <option value="background">background</option>
       </select>
-    </>
-  )
-}
-
-function CreateCustomStreamInput({ onCreate }) {
-  const [stream, setStream] = useState({ link: '' })
-  const handleChangeStream = useCallback((oldLink, stream) => {
-    setStream(stream)
-  })
-  const handleSubmit = useCallback(
-    (ev) => {
-      ev.preventDefault()
-      onCreate(stream.link, stream)
-      setStream({ link: '' })
-    },
-    [onCreate, stream],
-  )
-  return (
-    <form onSubmit={handleSubmit}>
-      <CustomStreamInput onChange={handleChangeStream} {...stream} />
+      <input
+        value={label}
+        onChange={(ev) => setLabel(ev.target.value)}
+        placeholder="Label (optional)"
+      />
       <button type="submit">add stream</button>
     </form>
   )