fix(editor): improve SQL completion insertion

apps/desktop/src/lib/editor/sqlCompletionInsertion.ts

@@ -0,0 +1,14 @@
+export type SqlCompletionItemType = "keyword" | "table" | "column" | "snippet" | "function" | "schema" | "property" | "text";
+
+const COMPLETION_SPACE_BLOCKING_CHARACTERS = new Set([",", ";", ":", ")", "]", "}", "'", '"']);
+
+export function appendSqlCompletionSpace(insertText: string, options: { enabled: boolean; itemType: SqlCompletionItemType; nextCharacter?: string }): string {
+  if (!options.enabled || options.itemType === "property" || options.itemType === "text" || options.itemType === "schema" || options.itemType === "snippet" || options.itemType === "function") return insertText;
+  if (!insertText || /\s$/.test(insertText) || insertText.endsWith(".")) return insertText;
+
+  const nextCharacter = options.nextCharacter ?? "";
+  if (/\s/.test(nextCharacter) || COMPLETION_SPACE_BLOCKING_CHARACTERS.has(nextCharacter)) return insertText;
+
+  // Avoid producing `table AS t,` or `column)` when the cursor is before SQL punctuation.
+  return `${insertText} `;
+}