[prince-0408]

Contributor checklist

• This pull request is on a separate branch and not the main branch
• I have tested my code with the ./gradlew lintKotlin detekt test command as directed in the testing section of the contributing guide

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Description

This PR fixes two layout and window decor issues on Android 16 (API 36, tested on Pixel 9) where edge-to-edge windowing is enforced:

1. Massive grey screen overlay:

   • empty_state_banner_container in input_method_view.xml was set to android:layout_width="0dp" inside a vertical LinearLayout (top_container). On clean installs or before language data is cached, the empty state text wrapped character-by-character vertically, expanding top_container to ~1,500px and blowing up the entire keyboard window frame to >2,200px.
   • Setting the theme background directly on targetWindow.decorView caused the entire oversized IME window to paint solid grey over the host application.
   • Fix: Changed empty_state_banner_container width from 0dp to match_parent and stripped obsolete ConstraintLayout attributes. Kept decorView and root backgrounds transparent, applying the theme background directly to keyboardCard.

2. Keyboard bottom row flush against gesture bar:

   • On gesture navigation, bottom system navigation insets are small (~16–24dp). Without extra bottom clearance, the bottom row of keys (?123, spacebar, ., enter) sat directly on top of the system navigation bar (∨, gesture bar, and 🌐).
   • Fix: Added a 16dp bottom cushion (extraBottomPadding) to keyboardCard.setPadding() in docked mode so the keys have comfortable breathing room while the card's background color fills behind the navigation bar seamlessly.

Key Files Changed

• input_method_view.xml: Fixed empty_state_banner_container width to match_parent.
• KeyboardThemeManager.kt: Ensured decorView and root are transparent; applied theme background and navigation bar padding + 16dp bottom cushion to keyboardCard.
• GeneralKeyboardIME.kt: Targeted keyboardCard for docked onComputeInsets() location calculations.
• CHANGELOG.md: Added bug fix entry referencing [Bug]: Keyboard decor obscures screen and layout expands on Android 16 (API 36) #759.

Testing

• Verified on Pixel 9 (API 36.0, Android 16 emulator): confirmed keyboard window frame shrinks from 2,200px to ~834px docked at the bottom, grey block is eliminated, and keys have comfortable clearance from the navigation bar.
• Tested ./gradlew lintKotlin: Passed with 0 errors.
• Tested ./gradlew detekt: Passed with 0 errors.
• Tested ./gradlew testKeyboardsDebugUnitTest: 35 tasks passed / up to date.

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Related issue

• Closes [Bug]: Keyboard decor obscures screen and layout expands on Android 16 (API 36) #759

[andrewtavis]

Hey @prince-0408 👋 As the issues in #758 are from me not having the latest Android Studio, I think we're good to close this one and move on to other priorities. Thanks for opening the PR!