fix: show the soft keyboard when a long-press starts text selection in TextInput on Android

[idoyana]

Summary

On Android, long-pressing text in a TextInput while the soft keyboard is hidden starts text selection (highlight + Cut/Copy toolbar) and focuses the field — but the soft keyboard never appears, leaving the user unable to type over the selection. This happens both when the input was unfocused and when it was focused with the keyboard dismissed.

Root cause: ReactEditText.onAttachedToWindow() calls super.setTextIsSelectable(true) (a removeClippedSubviews workaround, #6805). That makes isTextSelectable() return true, so the platform Editor#startActionModeInternal() skips its own "Show the IME to be able to replace text" branch — it is gated on !isTextSelectable() and deliberately skips read-only selectable text, which every RN TextInput now masquerades as. RN's own keyboard paths cover only clicks and programmatic focus (see the comment on requestFocusProgrammatically()); focus gained through long-press selection is a third path neither covers.

Fix: compensate in ReactEditText, mirroring the platform branch it opted out of —

• request the keyboard when a selection/insertion action mode is created (onCreateActionMode), and
• when focus is gained with a non-collapsed selection (onFocusChanged) — the action mode can be created before the view becomes the IME-served view, so this re-requests once focus has landed.

Both sites go through a shared guard (isEnabled — the editable prop maps to it, isInTouchMode, showSoftInputOnFocus) that mirrors requestFocusProgrammatically(), so read-only inputs and showSoftInputOnFocus={false} are unaffected. showSoftInput is idempotent, so an already-visible keyboard is a no-op.

Fixes #57470 (reproduced there with a bare TextInput in a plain View, no third-party components).

Changelog:

[ANDROID] [FIXED] - Show the soft keyboard when a long-press starts text selection in TextInput

Test Plan:

RNTester TextInput example on a Pixel 10 Pro (Android 16, Gboard), -PreactNativeArchitectures=arm64-v8a:

Before (main, 0015d1e4f9) — long-press a word in the prefilled "Default color text" field with the keyboard hidden:

• word selected + Cut/Copy toolbar, no keyboard
• logcat: zero ImeTracker events; dumpsys input_method → mInputShown=false

After (this change) — same gestures:

• Unfocused field, long-press a word → selection + toolbar + keyboard appears:
  ImeTracker: onRequestShow at ORIGIN_CLIENT reason SHOW_SOFT_INPUT → onShown; mInputShown=true
• Focused field, dismiss keyboard (back), long-press → keyboard appears (same trace)
• Plain tap → unchanged (framework fromUser=true request + RN's existing click path, same as before the change)
• Selection is preserved and the selection toolbar stays up while the keyboard shows — matching stock EditText behavior

./gradlew :packages:react-native:ReactAndroid:ktfmtCheck passes.

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@Abbondanzo has imported this pull request. If you are a Meta employee, you can view this in D110990211.