Project panel: Deselect entries on remaining blank space click + Remove hover color for selected entries (#22073)

tims created 

Closes #22072

Clicking on the remaining space now allows a single click to deselect
all selected items. Check the issue for a preview of the current state
and how it works in VSCode.

Bonus: I found the hover color on selected items to be distracting. When
I have many entries selected and hover over them, it becomes hard to
tell if a particular entry is selected while the mouse pointer is on it.
This PR removes hover coloring for selected entries, mimicking how
VSCode handles it.

This PR:
<img
src="https://github.com/user-attachments/assets/9c4b20fc-df93-4868-b7fe-4045433e85b2"
alt="zed" width="450px" />

Release Notes:

- Clicking on empty space in the Project Panel now deselects all
selected items.

Change summary

crates/project_panel/src/project_panel.rs | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)

Detailed changes

crates/project_panel/src/project_panel.rs 🔗 

@@ -3224,7 +3224,9 @@ impl ProjectPanel {
             .border_1()
             .border_r_2()
             .border_color(border_color)
-            .hover(|style| style.bg(bg_hover_color))
+            .when(!is_marked && !is_active, |div| {
+                div.hover(|style| style.bg(bg_hover_color))
+            })
             .when(is_local, |div| {
                 div.on_drag_move::<ExternalPaths>(cx.listener(
                     move |this, event: &DragMoveEvent<ExternalPaths>, cx| {
@@ -3897,6 +3899,11 @@ impl Render for ProjectPanel {
                         this.hide_scrollbar(cx);
                     }
                 }))
+                .on_click(cx.listener(|this, _event, cx| {
+                    cx.stop_propagation();
+                    this.selection = None;
+                    this.marked_entries.clear();
+                }))
                 .key_context(self.dispatch_context(cx))
                 .on_action(cx.listener(Self::select_next))
                 .on_action(cx.listener(Self::select_prev))