editor: Move blame popover from hover_tooltip to editor prepaint (#29320)

WIP!

In light of having more control over blame popover from editor.

This fixes: https://github.com/zed-industries/zed/issues/28645,
https://github.com/zed-industries/zed/issues/26304

- [x] Initial rendering
- [x] Handle smart positioning (edge detection, etc)
- [x] Delayed hovering, release, etc
- [x] Test blame message selection
- [x] Fix tagged issues

Release Notes:

- Git inline blame popover now dismisses when the cursor is moved, the
editor is scrolled, or the command palette is opened.

crates/editor/src/git/blame.rs

@@ -7,10 +7,11 @@ use git::{
     parse_git_remote_url,
 };
 use gpui::{
-    AnyElement, App, AppContext as _, Context, Entity, Hsla, Subscription, Task, TextStyle,
-    WeakEntity, Window,
+    AnyElement, App, AppContext as _, Context, Entity, Hsla, ScrollHandle, Subscription, Task,
+    TextStyle, WeakEntity, Window,
 };
 use language::{Bias, Buffer, BufferSnapshot, Edit};
+use markdown::Markdown;
 use multi_buffer::RowInfo;
 use project::{
     Project, ProjectItem,
@@ -98,10 +99,18 @@ pub trait BlameRenderer {
         &self,
         _: &TextStyle,
         _: BlameEntry,
+        _: &mut App,
+    ) -> Option<AnyElement>;
+
+    fn render_blame_entry_popover(
+        &self,
+        _: BlameEntry,
+        _: ScrollHandle,
         _: Option<ParsedCommitMessage>,
+        _: Entity<Markdown>,
         _: Entity<Repository>,
         _: WeakEntity<Workspace>,
-        _: Entity<Editor>,
+        _: &mut Window,
         _: &mut App,
     ) -> Option<AnyElement>;
 
@@ -139,10 +148,20 @@ impl BlameRenderer for () {
         &self,
         _: &TextStyle,
         _: BlameEntry,
+        _: &mut App,
+    ) -> Option<AnyElement> {
+        None
+    }
+
+    fn render_blame_entry_popover(
+        &self,
+        _: BlameEntry,
+        _: ScrollHandle,
         _: Option<ParsedCommitMessage>,
+        _: Entity<Markdown>,
         _: Entity<Repository>,
         _: WeakEntity<Workspace>,
-        _: Entity<Editor>,
+        _: &mut Window,
         _: &mut App,
     ) -> Option<AnyElement> {
         None