Feature: respect indent in brace-based languages

[mikehearn]

Claude 3 Opus likes to append methods to a Java/Kotlin class by doing a search/replace on an empty block whilst providing indented text. Aider just adds this to the end of the file, but it would be smarter to spot when the file ends with a brace and position the newly inserted block within the right scope, as determined by computing the minimum indent of the provided block.

Example:

 <<<<<<< SEARCH
 =======
     private fun invokeTask(task: BuildTask, cacheKey: String?, retryCount: Int = 0): Any? {
         check(retryCount <= maxRetries)
         return try {
             executeTask(task, listOf(task), 0, cacheKey)
         } catch (e: RetryLater) {
             if (retryCount < maxRetries) {
                 Logger.info("Task ${task.taskDisplayName} requested retry (attempt ${retryCount + 1}): ${e.message}")
                 if (e.delay != null) {
                     Logger.info("Waiting ${e.delay} before retrying ${task.taskDisplayName}")
                     Thread.sleep(e.delay.toMillis())
                 }
                 invokeTask(task, cacheKey, retryCount + 1)
             } else {
                 Logger.warn("Task ${task.taskDisplayName} failed after $maxRetries retries")
                 throw e
             }
         }
     }

 >>>>>>> REPLACE

Here, the right place to add the new method is inside the class, so one line above where aider chooses to put it.