TW-1545: Add adr for this ticket

docs/adr/0020-keyboard-is-disappeared-then-appeared.md

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+# 20. Keyboard is disappeared then appeared if we send message in a chat which found from search
+
+Date: 2024-03-12
+
+## Status
+
+Accepted
+
+- Issue: [#1545](https://github.com/linagora/twake-on-matrix/issues/1545)
+
+## Context
+
+- In TextField use onTapOutside to hide the keyboard but don't know exactly which screen the keyboard is enabled on.
+Therefore, when opening the keyboard on screen A and then switching to screen B, TextField A is still listening onTapOutside. 
+So Keyboard is disappeared then appears
+
+## Decision
+- Check exactly screen the keyboard is enabled in `dismissKeyboard` function.
+
+```dart
+void dismissKeyboard(BuildContext context) {
+  if (ModalRoute.of(context)?.isCurrent == true) {
+    if (FocusManager.instance.primaryFocus?.hasFocus == true) {
+      FocusManager.instance.primaryFocus?.unfocus();
+    }
+  }
+}
+
+```
+
+## Consequences
+
+- The keyboard will not disappear and then reappear when switching screens.