Allow backspace to delete a char when inside leftmost token (#1768)

* Allow backspace to delete a char when inside a token

Regression in #1741

Fixes #1771

Fixes this the problem shown in this comment: #1745 (comment)

And this Slack thread:
https://clojurians.slack.com/archives/CBE668G4R/p1654897313506689

Co-authored-by: Peter Strömberg <pez@pezius.com>

CHANGELOG.md

@@ -4,6 +4,8 @@ Changes to Calva.
 
 ## [Unreleased]
 
+- Fix: [Paredit strict backspace in the leftmost symbol/keyword/thing inserts a space instead](https://github.com/BetterThanTomorrow/calva/pull/1771)
+
 ## [2.0.284] - 2022-06-11
 
 - [Add a command to restart clojure-lsp](https://github.com/BetterThanTomorrow/calva/issues/1727)

src/cursor-doc/paredit.ts

@@ -797,6 +797,8 @@ function onlyWhitespaceLeftOfCursor(doc: EditableDocument, cursor: LispTokenCurs
   const token = cursor.getToken();
   if (token.type === 'ws') {
     return token.offset === 0;
+  } else if (doc.selection.anchor > cursor.offsetStart) {
+    return false;
   }
   const prevToken = cursor.getPrevToken();
 

src/extension-test/unit/cursor-doc/paredit-test.ts

@@ -1314,6 +1314,13 @@ describe('paredit', () => {
         await paredit.backspace(a);
         expect(textAndSelection(a)).toEqual(textAndSelection(b));
       });
+
+      it('Deletes a character when inside a token on a blank line', async () => {
+        const a = docFromTextNotation('(if• :|foo)');
+        const b = docFromTextNotation('(if• |foo)');
+        await paredit.backspace(a);
+        expect(textAndSelection(a)).toEqual(textAndSelection(b));
+      });
     });
 
     describe('Kill character forwards (delete)', () => {