ADFA-40: apply FLAG_SECURE immediately when Instant Hide is toggled

Arming Instant Hide in Settings set the preference but did not re-apply the
FLAG_SECURE policy, which otherwise runs only on the next onResume. The
Settings window stayed screenshotable and unmasked in Recents until the user
navigated away and back -- contrary to the armed-state contract that masking
applies the moment the feature is on.

The toggle callback now resolves the hosting EdgeToEdgeIDEActivity from the
preference's context (unwrapping any ContextWrapper) and re-applies
applyScreenSecurity() in place. Turning the feature off clears the flag
immediately too.

Addresses a CodeRabbit review finding on PR #2133.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VQsMNLYmV7gf2wqLoYRDkm

Author: davidschachterADFA

app/src/main/java/com/itsaky/androidide/app/EdgeToEdgeIDEActivity.kt

@@ -212,6 +212,15 @@ abstract class EdgeToEdgeIDEActivity : IDEActivity() {
 	 */
 	protected open fun isInstantHideGesturesEnabled(): Boolean = true
 
+	/**
+	 * Re-applies the FLAG_SECURE policy immediately, for callers that change the armed state while a
+	 * screen is already resumed (arming the toggle in Settings). Without this the new policy would not
+	 * take effect until the next [onResume], leaving the current window screenshotable in between.
+	 */
+	internal fun applyInstantHideScreenSecurity() {
+		securityController.applyScreenSecurity()
+	}
+
 	override fun onResume() {
 		super.onResume()
 		securityController.applyScreenSecurity()

app/src/main/java/com/itsaky/androidide/preferences/securityPrefExts.kt

@@ -18,7 +18,9 @@
 package com.itsaky.androidide.preferences
 
 import android.content.Context
+import android.content.ContextWrapper
 import androidx.preference.Preference
+import com.itsaky.androidide.app.EdgeToEdgeIDEActivity
 import com.itsaky.androidide.resources.R
 import com.itsaky.androidide.idetooltips.TooltipTag.PREFS_SECURITY
 import com.itsaky.androidide.preferences.internal.SecurityPreferences
@@ -66,6 +68,26 @@ class InstantHide(
 	override fun onPreferenceChanged(preference: Preference, newValue: Any?): Boolean {
 		SecurityPreferences.instantHideEnabled =
 			newValue as Boolean? ?: SecurityPreferences.instantHideEnabled
+		// Apply the FLAG_SECURE policy to this already-resumed Settings window now: the armed-state
+		// contract is that screenshots/Recents are masked the moment Instant Hide is on, but
+		// applyScreenSecurity() otherwise only runs on the next onResume, leaving a gap right after
+		// arming. Also clears the flag immediately when the user turns it back off.
+		preference.context.findIDEActivity()?.applyInstantHideScreenSecurity()
 		return true
 	}
 }
+
+/**
+ * The hosting [EdgeToEdgeIDEActivity], or null. A preference's context is whatever the host passed
+ * when the row was built -- today the Activity itself, but unwrapping the [ContextWrapper] chain
+ * keeps this correct if a themed wrapper is ever interposed, since a missed call would silently
+ * leave the window screenshotable.
+ */
+private fun Context.findIDEActivity(): EdgeToEdgeIDEActivity? {
+	var ctx: Context? = this
+	while (ctx is ContextWrapper) {
+		if (ctx is EdgeToEdgeIDEActivity) return ctx
+		ctx = ctx.baseContext
+	}
+	return null
+}