Fix untab crash

1 files changed, 5 insertions, 1 deletions

diff --git a/src/Buffer.zig b/src/Buffer.zig
index 473674c..57ecd20 100644
--- a/src/Buffer.zig
+++ b/src/Buffer.zig
@@ -584,7 +584,11 @@ pub fn unindent(self: *Buffer) !void {
     const desired_rsize = indentation_rsize - 1 - (indentation_rsize - 1) % self.config.tab_stop;
     const desired_size = row.rxToCx(self.config, desired_rsize);
 
-    self.cx -= indentation_size - desired_size;
+    if (self.cx < indentation_size - desired_size) {
+        self.cx = 0;
+    } else {
+        self.cx -= indentation_size - desired_size;
+    }
 
     // TODO: ArrayList needs orderedRemoveNItems
     while (indentation_size > desired_size) : (indentation_size -= 1) {