Backport termux/termux-app PRs (2025-2026), add signing keystores, fix CI for self-hosted runner

[Copilot]

Backports all legitimate open PRs from the upstream termux/termux-app repository (2025-2026 timeframe), adds organized signing infrastructure, and fixes CI workflows for the mp4 self-hosted runner.

Upstream PRs Implemented

• Added(terminal): add separate italic, bold and boldItalic font files termux/termux-app#4813 — Separate italic/bold/boldItalic font files. Refactors TerminalRenderer from single-typeface to per-style typeface arrays with intelligent fallback (fake bold/skew when dedicated font unavailable). Adds font-italic.ttf, font-bold.ttf, font-bold-italic.ttf constants to TermuxConstants.
• Fix fullscreen mode on Android 11+ where navigation bar was not hidden termux/termux-app#5007 — Fix fullscreen on Android 11+. Uses SYSTEM_UI_FLAG_IMMERSIVE_STICKY flags and re-applies on onWindowFocusChanged to keep nav bar hidden.
• Fixed: Remove trailing whitespace padding when copying multi-line text termux/termux-app#4940 — Strip trailing whitespace when copying non-wrapped terminal lines. Preserves wrapped-line spaces. Fixes lineFillsWidth to check against full column width.
• file-receiver: add fallback editor when termux-file-editor is not configured termux/termux-app#4972 — Fallback editor discovery (nano → vim → vi) when ~/bin/termux-file-editor doesn't exist.
• Enable RTL support in AndroidManifest.xml termux/termux-app#4931 — Enable android:supportsRtl="true" in AndroidManifest.
• Changed: Bump actions/upload-artifact from 6 to 7 termux/termux-app#4990 — Bump actions/upload-artifact v6 → v7.
• chore(strings): use sentence case for non-terminal UI text termux/termux-app#4764 — Sentence case for non-terminal UI strings (strings.xml).
• chore: fastlane full_description.txt: reword to simplify translation termux/termux-app#4412 — Rewrite fastlane full_description.txt with HTML formatting.
• Changed: Correct typo and use keyboard keys formatting instead of code snippet one in README.md termux/termux-app#4994 — Fix typos in README (changelogs, It's) and use <kbd> formatting.

Signing Infrastructure

• Debug keystore (.github/signing/debug.jks, RSA-2048) and release keystore (.github/signing/release.jks, RSA-4096)
• app/build.gradle signing configs for both build types; release passwords overridable via TERMUX_RELEASE_STORE_PASSWORD / TERMUX_RELEASE_KEY_PASSWORD env vars
• New release_build.yml workflow

CI Fixes

• All workflows → runs-on: mp4
• Added android-actions/setup-android@v3 step to resolve ANDROID_HOME not found on self-hosted runner
• Added apt-get install unzip step before setup-android in all workflows, since the mp4 self-hosted runner does not have unzip pre-installed (required by android-actions/setup-android@v3 to extract the Android commandline tools)
• Added keystore verification steps

Key code change — TerminalRenderer multi-style support

// Before: single typeface, direct field access
mRenderer = new TerminalRenderer(textSize, typeface);
float w = mRenderer.mFontWidth;

// After: per-style typefaces with getter API
mRenderer = new TerminalRenderer(textSize);
mRenderer.setTypeface(Typeface.MONOSPACE, TypefaceStyle.NORMAL);
mRenderer.setTypeface(italicTypeface, TypefaceStyle.ITALIC);
float w = mRenderer.getFontWidth();

All 145 unit tests pass. No new CodeQL alerts (5 pre-existing missing-workflow-permissions inherited from upstream).

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

[EduardoC3677]

@copilot Run android-actions/setup-android@v3
Downloading commandline tools from https://dl.google.com/android/repository/commandlinetools-linux-12266719_latest.zip
/home/runner/work/_actions/android-actions/setup-android/v3/dist/index.js:3053
throw new Error(Unable to locate executable file: ${tool}. Please verify either the file path exists or the file can be found within a directory specified by the PATH environment variable. Also check the file mode to verify the file is executable.);
^

Error: Unable to locate executable file: unzip. Please verify either the file path exists or the file can be found within a directory specified by the PATH environment variable. Also check the file mode to verify the file is executable.
at Object. (/home/runner/work/_actions/android-actions/setup-android/v3/dist/index.js:3053:27)
at Generator.next ()
at fulfilled (/home/runner/work/_actions/android-actions/setup-android/v3/dist/index.js:2906:58)

Node.js v20.20.0

[Copilot]

@copilot Run android-actions/setup-android@v3
Downloading commandline tools from https://dl.google.com/android/repository/commandlinetools-linux-12266719_latest.zip
/home/runner/work...

Fixed in 9953e06. The self-hosted mp4 runner doesn't have unzip pre-installed, which android-actions/setup-android@v3 needs to extract the Android commandline tools. Added sudo apt-get install -y unzip step before setup-android in all 5 workflows.