M: Implement projection swap on ctrl + space

rsconcept/frontend/src/components/RSInput/RSInput.tsx

@@ -116,6 +116,22 @@ const RSInput = forwardRef<ReactCodeMirrorRef, RSInputProps>(
           if (!selection.empty || !schema) {
             return;
           }
+          const wordRange = text.getWord(selection.from);
+          if (wordRange) {
+            const word = text.getText(wordRange.from, wordRange.to);
+            if (word.length > 2 && (word.startsWith('Pr') || word.startsWith('pr'))) {
+              text.setSelection(wordRange.from, wordRange.from + 2);
+              if (word.startsWith('Pr')) {
+                text.replaceWith('pr');
+              } else {
+                text.replaceWith('Pr');
+              }
+              event.preventDefault();
+              event.stopPropagation();
+              return;
+            }
+          }
+
           const hint = text.getText(selection.from - 1, selection.from);
           const type = guessCstType(hint);
           if (hint === getCstTypePrefix(type)) {

rsconcept/frontend/src/pages/ManualsPage/items/ui/HelpRSEditor.tsx

@@ -94,7 +94,7 @@ function HelpRSEditor() {
         <IconTree className='inline-icon' /> отображение{' '}
         <LinkTopic text='дерева разбора' topic={HelpTopic.UI_FORMULA_TREE} />
       </li>
-      <li>Ctrl + Пробел дополняет до незанятого имени</li>
+      <li>Ctrl + Пробел вставка незанятого имени / замена проекции</li>
 
       <h2>Термин и Текстовое определение</h2>
       <li>

rsconcept/frontend/src/utils/codemirror.ts

@@ -357,6 +357,10 @@ export class CodeMirrorWrapper {
     return this.ref.view.state.doc.sliceString(from, to);
   }
 
+  getWord(position: number): SelectionRange | null {
+    return this.ref.view.state.wordAt(position);
+  }
+
   getSelection(): SelectionRange {
     return this.ref.view.state.selection.main;
   }