fix: don't auto-correct commands

Prevent /fc from turning into /FC.

app/src/main/java/io/annaclemens/xivchat/ui/messages/MessagesTabsFragment.kt

@@ -1,6 +1,7 @@
 package io.annaclemens.xivchat.ui.messages
 
 import android.os.Bundle
+import android.text.InputType
 import android.view.LayoutInflater
 import android.view.Menu
 import android.view.MenuInflater
@@ -11,6 +12,7 @@ import android.view.inputmethod.EditorInfo
 import android.widget.SearchView
 import androidx.activity.viewModels
 import androidx.core.view.iterator
+import androidx.core.widget.addTextChangedListener
 import androidx.fragment.app.Fragment
 import androidx.lifecycle.ViewModelProvider
 import androidx.lifecycle.lifecycleScope
@@ -114,6 +116,36 @@ class MessagesTabsFragment : Fragment() {
         }
 
         root.messageInput.apply {
+            // don't auto-correct for command names
+            this.editText?.addTextChangedListener { text ->
+                if (text == null) {
+                    return@addTextChangedListener
+                }
+
+                val editText = this.editText ?: return@addTextChangedListener
+
+                val startsWithSlash = text.startsWith('/')
+
+                val start = editText.selectionStart
+                val end = editText.selectionEnd
+                val firstSpace = text.indexOf(' ').let { if (it == -1) text.length else it }
+
+                val inFirstWord = start <= firstSpace || end <= firstSpace
+
+                val new = if (startsWithSlash && inFirstWord) {
+                    // disable autocorrect if in the first word and it starts with a slash
+                    editText.inputType and InputType.TYPE_TEXT_FLAG_AUTO_CORRECT.inv()
+                } else {
+                    // enable autcorrect otherwise
+                    editText.inputType or InputType.TYPE_TEXT_FLAG_AUTO_CORRECT
+                }
+
+                // only change the input type if necessary (holding down backspace stops when input type changes)
+                if (editText.inputType != new) {
+                    editText.inputType = new
+                }
+            }
+
             fun sendMessage() {
                 val view = this.editText ?: return
                 val messageText = view.text.toString()