Akira Sousa b479d1ef49 title_bar: Add configurable window controls position (#38834)
## 🎯 Description
Adds configurable window control buttons (minimize, maximize, close)
positioning for Linux, allowing users to choose between macOS-style
(left side) or Windows-style (right side) placement.

##  Features
- New `title_bar.window_controls_position` setting with `"left"` and
`"right"` options
- Left positioning: macOS style (Close → Minimize → Maximize)
- Right positioning: Windows style (Minimize → Maximize → Close)
- Fixed transparent background issues for window controls
- Maintains consistent styling with Zed's theme

## 🔧 Technical Changes

### Settings System
- Added `WindowControlsPosition` enum in `settings_content.rs`
- Extended `TitleBarSettingsContent` with `window_controls_position`
field
- Updated `TitleBarSettings` to include the new configuration

### Title Bar Layout
- Modified `platform_title_bar.rs` to use setting for layout positioning
- Added conditional logic for `justify_start()` vs `justify_between()`
based on position
- Fixed transparent container background by adding `bg(titlebar_color)`

### Window Controls
- Updated `platform_linux.rs` to reorder buttons based on position
setting
- Changed button background from `ghost_element_background` to
`title_bar_background`
- Implemented proper button sequencing for both positions

## 🧪 How to Test
1. Add to your Zed settings:
   ```json
   {
     "title_bar": {
       "window_controls_position": "left"
     }
   }
   ```
   or
   ```json
   {
     "title_bar": {
       "window_controls_position": "right"
     }
   }
   ```
2. Restart Zed
3. Verify buttons are positioned correctly
4. Check that background is not transparent
5. Test button functionality (minimize, maximize, close)

## �� Expected Behavior
- **Left position**: Buttons appear on the left side of the title bar in
Close → Minimize → Maximize order
- **Right position**: Buttons appear on the right side of the title bar
in Minimize → Maximize → Close order
- **Background**: Solid background matching Zed's theme (no
transparency)

## 🔍 Files Changed
- `crates/settings/src/settings_content.rs` - Added enum and setting
- `crates/title_bar/src/title_bar_settings.rs` - Updated settings struct
- `crates/title_bar/src/platform_title_bar.rs` - Modified layout logic
- `crates/title_bar/src/platforms/platform_linux.rs` - Updated button
ordering and styling

## 🎨 Design Rationale
This feature provides Linux users with the flexibility to choose their
preferred window control button layout, improving the user experience by
allowing them to match their desktop environment's conventions or
personal preferences.

##  Checklist
- [x] Code compiles without errors
- [x] Settings are properly serialized/deserialized
- [x] Background transparency issues resolved
- [x] Button ordering works correctly for both positions
- [x] Layout adapts properly based on configuration
- [x] No breaking changes to existing functionality

## 🔗 Related
This addresses the need for customizable window control positioning on
Linux, providing consistency with user expectations from different
desktop environments.


![demo2](https://github.com/user-attachments/assets/7333db34-d54e-427c-ac52-140925363f91)
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WIP
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