Remove tab-size setting (#12835)

Co-authored-by: Alex Waygood <[email protected]>
Closes #12041

Author: MichaReiser

crates/ruff/tests/format.rs

@@ -818,7 +818,13 @@ if True:
 
         ----- stderr -----
         ruff failed
-          Cause: The `tab-size` option has been renamed to `indent-width` to emphasize that it configures the indentation used by the formatter as well as the tab width. Please update `[RUFF-TOML-PATH]` to use `indent-width = <value>` instead.
+          Cause: Failed to parse [RUFF-TOML-PATH]
+          Cause: TOML parse error at line 1, column 1
+          |
+        1 | 
+          | ^
+        unknown field `tab-size`
+
         "###);
     });
     Ok(())

crates/ruff_workspace/src/configuration.rs

@@ -445,15 +445,6 @@ impl Configuration {
             }
         };
 
-        #[allow(deprecated)]
-        if options.tab_size.is_some() {
-            let config_to_update = path.map_or_else(
-                || String::from("your `--config` CLI arguments"),
-                |path| format!("`{}`", fs::relativize_path(path)),
-            );
-            return Err(anyhow!("The `tab-size` option has been renamed to `indent-width` to emphasize that it configures the indentation used by the formatter as well as the tab width. Please update {config_to_update} to use `indent-width = <value>` instead."));
-        }
-
         Ok(Self {
             builtins: options.builtins,
             cache_dir: options

crates/ruff_workspace/src/options.rs

@@ -415,17 +415,6 @@ pub struct Options {
     )]
     pub indent_width: Option<IndentWidth>,
 
-    /// The number of spaces a tab is equal to when enforcing long-line violations (like `E501`)
-    /// or formatting code with the formatter.
-    ///
-    /// This option changes the number of spaces inserted by the formatter when
-    /// using soft-tabs (`indent-style = space`).
-    #[deprecated(
-        since = "0.1.2",
-        note = "The `tab-size` option has been renamed to `indent-width` to emphasize that it configures the indentation used by the formatter as well as the tab width. Please update your configuration to use `indent-width = <value>` instead."
-    )]
-    pub tab_size: Option<IndentWidth>,
-
     #[option_group]
     pub lint: Option<LintOptions>,