Restore MarkdownTextInput contents (#2902)

* Restore `MarkdownTextInput` contents: create a `MarkdownTextInputStateSaver` and use it to save and restore the text and selection.

* Add default text flags to the markdown composer

changelog.d/2896.bugfix

@@ -0,0 +1 @@
+Set auto captilization, multiline and autocompletion flags for the markdown EditText.

changelog.d/2898.bugfix

@@ -0,0 +1 @@
+Restoree Markdown text input contents when returning to the room screen.

features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/messagecomposer/MessageComposerPresenter.kt

@@ -62,11 +62,11 @@ import io.element.android.libraries.permissions.api.PermissionsEvents
 import io.element.android.libraries.permissions.api.PermissionsPresenter
 import io.element.android.libraries.textcomposer.mentions.ResolvedMentionSuggestion
 import io.element.android.libraries.textcomposer.mentions.rememberMentionSpanProvider
-import io.element.android.libraries.textcomposer.model.MarkdownTextEditorState
 import io.element.android.libraries.textcomposer.model.Message
 import io.element.android.libraries.textcomposer.model.MessageComposerMode
 import io.element.android.libraries.textcomposer.model.Suggestion
 import io.element.android.libraries.textcomposer.model.TextEditorState
+import io.element.android.libraries.textcomposer.model.rememberMarkdownTextEditorState
 import io.element.android.services.analytics.api.AnalyticsService
 import kotlinx.collections.immutable.persistentListOf
 import kotlinx.collections.immutable.toPersistentList
@@ -132,7 +132,7 @@ class MessageComposerPresenter @Inject constructor(
         if (isTesting) {
             richTextEditorState.isReadyToProcessActions = true
         }
-        val markdownTextEditorState = remember { MarkdownTextEditorState(initialText = null, initialFocus = false) }
+        val markdownTextEditorState = rememberMarkdownTextEditorState(initialText = null, initialFocus = false)
 
         var isMentionsEnabled by remember { mutableStateOf(false) }
         LaunchedEffect(Unit) {

libraries/textcomposer/impl/src/main/kotlin/io/element/android/libraries/textcomposer/components/markdown/MarkdownTextInput.kt

@@ -18,6 +18,7 @@ package io.element.android.libraries.textcomposer.components.markdown
 
 import android.graphics.Color
 import android.text.Editable
+import android.text.InputType
 import android.text.Selection
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.padding
@@ -59,6 +60,10 @@ fun MarkdownTextInput(
                 setPadding(0)
                 setBackgroundColor(Color.TRANSPARENT)
                 setText(state.text.value())
+                inputType = InputType.TYPE_CLASS_TEXT or
+                    InputType.TYPE_TEXT_FLAG_CAP_SENTENCES or
+                    InputType.TYPE_TEXT_FLAG_MULTI_LINE or
+                    InputType.TYPE_TEXT_FLAG_AUTO_CORRECT
                 if (canUpdateState) {
                     setSelection(state.selection.first, state.selection.last)
                     setOnFocusChangeListener { _, hasFocus ->

libraries/textcomposer/impl/src/main/kotlin/io/element/android/libraries/textcomposer/model/MarkdownTextEditorState.kt

@@ -16,14 +16,19 @@
 
 package io.element.android.libraries.textcomposer.model
 
+import android.os.Parcelable
 import android.text.Spannable
 import android.text.SpannableString
 import android.text.SpannableStringBuilder
 import android.text.Spanned
+import androidx.compose.runtime.Composable
 import androidx.compose.runtime.Stable
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableIntStateOf
 import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.saveable.Saver
+import androidx.compose.runtime.saveable.SaverScope
+import androidx.compose.runtime.saveable.rememberSaveable
 import androidx.compose.runtime.setValue
 import androidx.core.text.getSpans
 import io.element.android.libraries.matrix.api.core.UserId
@@ -33,6 +38,7 @@ import io.element.android.libraries.textcomposer.components.markdown.StableCharS
 import io.element.android.libraries.textcomposer.mentions.MentionSpan
 import io.element.android.libraries.textcomposer.mentions.MentionSpanProvider
 import io.element.android.libraries.textcomposer.mentions.ResolvedMentionSuggestion
+import kotlinx.parcelize.Parcelize
 
 @Stable
 class MarkdownTextEditorState(
@@ -119,4 +125,39 @@ class MarkdownTextEditorState(
             }
         }
     }
+
+    @Parcelize
+    data class SavedState(
+        val text: CharSequence,
+        val selectionStart: Int,
+        val selectionEnd: Int,
+    ) : Parcelable
+}
+
+object MarkdownTextEditorStateSaver : Saver<MarkdownTextEditorState, MarkdownTextEditorState.SavedState> {
+    override fun restore(value: MarkdownTextEditorState.SavedState): MarkdownTextEditorState {
+        return MarkdownTextEditorState(
+            initialText = "",
+            initialFocus = false,
+        ).apply {
+            text.update(value.text, true)
+            selection = value.selectionStart..value.selectionEnd
+        }
+    }
+
+    override fun SaverScope.save(value: MarkdownTextEditorState): MarkdownTextEditorState.SavedState {
+        return MarkdownTextEditorState.SavedState(
+            text = value.text.value(),
+            selectionStart = value.selection.first,
+            selectionEnd = value.selection.last,
+        )
+    }
+}
+
+@Composable
+fun rememberMarkdownTextEditorState(
+    initialText: String? = null,
+    initialFocus: Boolean = false,
+): MarkdownTextEditorState {
+    return rememberSaveable(saver = MarkdownTextEditorStateSaver) { MarkdownTextEditorState(initialText, initialFocus) }
 }