fix: Skip duplicate checks at document end or blank text

Prevent autocomplete from truncating when the cursor is at the end of the document or when the text after the cursor is blank.

extensions/intellij/src/main/kotlin/com/github/continuedev/continueintellijextension/autocomplete/AutocompleteService.kt

@@ -120,13 +120,20 @@ class AutocompleteService(private val project: Project) {
         return ApplicationManager.getApplication().runReadAction<String> {
             val document = editor.document
             val caretOffset = editor.caretModel.offset
+
+            // Don't care about it if it's at the end of the document
+            if (caretOffset == document.textLength) return@runReadAction completion
+
             val N = 10
             var textAfterCursor = if (caretOffset + N <= document.textLength) {
                 document.getText(com.intellij.openapi.util.TextRange(caretOffset, caretOffset + N))
             } else {
                 document.getText(com.intellij.openapi.util.TextRange(caretOffset, document.textLength))
             }
 
+            // Avoid truncating the completion text when the text after the cursor is blank
+            if (textAfterCursor.isBlank()) return@runReadAction completion
+
             // Determine the index of a newline character within the text following the cursor.
             val newlineIndex = textAfterCursor.indexOf("\r\n").takeIf { it >= 0 } ?: textAfterCursor.indexOf('\n')
             // If a newline character is found and the current line is not empty, truncate the text at that point.