implement a safari hack for ime (#4186)

remove debug logs

use a better hack

implement a safari hack

extract `isSafari` and `isFirefox` to a global variable

src/lib/browser.native.ts

@@ -0,0 +1,2 @@
+export const isSafari = false
+export const isFirefox = false

src/lib/browser.ts

@@ -0,0 +1,6 @@
+// https://stackoverflow.com/questions/7944460/detect-safari-browser
+export const isSafari = /^((?!chrome|android).)*safari/i.test(
+  navigator.userAgent,
+)
+
+export const isFirefox = /firefox|fxios/i.test(navigator.userAgent)

src/lib/strings/embed-player.ts

@@ -1,5 +1,6 @@
 import {Dimensions, Platform} from 'react-native'
 
+import {isSafari} from 'lib/browser'
 import {isWeb} from 'platform/detection'
 const {height: SCREEN_HEIGHT} = Dimensions.get('window')
 
@@ -353,10 +354,6 @@ export function parseEmbedPlayerFromUrl(
 
     if (id && filename && dimensions && id.includes('AAAAC')) {
       if (Platform.OS === 'web') {
-        const isSafari = /^((?!chrome|android).)*safari/i.test(
-          navigator.userAgent,
-        )
-
         if (isSafari) {
           id = id.replace('AAAAC', 'AAAP1')
           filename = filename.replace('.gif', '.mp4')

src/screens/Messages/Conversation/MessageInput.web.tsx

@@ -10,6 +10,7 @@ import {
   useMessageDraft,
   useSaveMessageDraft,
 } from '#/state/messages/message-drafts'
+import {isSafari} from 'lib/browser'
 import * as Toast from '#/view/com/util/Toast'
 import {atoms as a, useTheme} from '#/alf'
 import {useSharedInputStyles} from '#/components/forms/TextField'
@@ -47,6 +48,25 @@ export function MessageInput({
     (e: React.KeyboardEvent<HTMLTextAreaElement>) => {
       // Don't submit the form when the Japanese or any other IME is composing
       if (isComposing.current) return
+
+      // see https://github.com/bluesky-social/social-app/issues/4178
+      // see https://www.stum.de/2016/06/24/handling-ime-events-in-javascript/
+      // see https://lists.w3.org/Archives/Public/www-dom/2010JulSep/att-0182/keyCode-spec.html
+      //
+      // On Safari, the final keydown event to dismiss the IME - which is the enter key - is also "Enter" below.
+      // Obviously, this causes problems because the final dismissal should _not_ submit the text, but should just
+      // stop the IME editing. This is the behavior of Chrome and Firefox, but not Safari.
+      //
+      // Keycode is deprecated, however the alternative seems to only be to compare the timestamp from the
+      // onCompositionEnd event to the timestamp of the keydown event, which is not reliable. For example, this hack
+      // uses that method: https://github.com/ProseMirror/prosemirror-view/pull/44. However, from my 500ms resulted in
+      // far too long of a delay, and a subsequent enter press would often just end up doing nothing. A shorter time
+      // frame was also not great, since it was too short to be reliable (i.e. an older system might have a larger
+      // time gap between the two events firing.
+      if (isSafari && e.key === 'Enter' && e.keyCode === 229) {
+        return
+      }
+
       if (e.key === 'Enter') {
         if (e.shiftKey) return
         e.preventDefault()

src/view/com/util/List.web.tsx

@@ -5,6 +5,7 @@ import {ReanimatedScrollEvent} from 'react-native-reanimated/lib/typescript/rean
 import {batchedUpdates} from '#/lib/batchedUpdates'
 import {useNonReactiveCallback} from '#/lib/hooks/useNonReactiveCallback'
 import {useScrollHandlers} from '#/lib/ScrollContext'
+import {isFirefox, isSafari} from 'lib/browser'
 import {usePalette} from 'lib/hooks/usePalette'
 import {useWebMediaQueries} from 'lib/hooks/useWebMediaQueries'
 import {addStyle} from 'lib/styles'
@@ -503,8 +504,6 @@ export const List = memo(React.forwardRef(ListImpl)) as <ItemT>(
 ) => React.ReactElement
 
 // https://stackoverflow.com/questions/7944460/detect-safari-browser
-const isSafari = /^((?!chrome|android).)*safari/i.test(navigator.userAgent)
-const isFirefox = /firefox|fxios/i.test(navigator.userAgent)
 
 const styles = StyleSheet.create({
   sideBorders: {