editor: Add support for no scroll margin in full mode (#41838)

Noticed this whilst testing the Docker debugger. I randomly scrolled the
console off screen and was confused briefly as to why this was the case.

Release Notes:

- The debugger query console will no longer needlessly overscroll.

crates/editor/src/element.rs

@@ -8,8 +8,8 @@ use crate::{
     HandleInput, HoveredCursor, InlayHintRefreshReason, JumpData, LineDown, LineHighlight, LineUp,
     MAX_LINE_LEN, MINIMAP_FONT_SIZE, MULTI_BUFFER_EXCERPT_HEADER_HEIGHT, OpenExcerpts, PageDown,
     PageUp, PhantomBreakpointIndicator, Point, RowExt, RowRangeExt, SelectPhase,
-    SelectedTextHighlight, Selection, SelectionDragState, SoftWrap, StickyHeaderExcerpt, ToPoint,
-    ToggleFold, ToggleFoldAll,
+    SelectedTextHighlight, Selection, SelectionDragState, SizingBehavior, SoftWrap,
+    StickyHeaderExcerpt, ToPoint, ToggleFold, ToggleFoldAll,
     code_context_menus::{CodeActionsMenu, MENU_ASIDE_MAX_WIDTH, MENU_ASIDE_MIN_WIDTH, MENU_GAP},
     display_map::{
         Block, BlockContext, BlockStyle, ChunkRendererId, DisplaySnapshot, EditorMargins,
@@ -8441,11 +8441,11 @@ impl Element for EditorElement {
                         window.request_layout(style, None, cx)
                     }
                     EditorMode::Full {
-                        sized_by_content, ..
+                        sizing_behavior, ..
                     } => {
                         let mut style = Style::default();
                         style.size.width = relative(1.).into();
-                        if sized_by_content {
+                        if sizing_behavior == SizingBehavior::SizeByContent {
                             let snapshot = editor.snapshot(window, cx);
                             let line_height =
                                 self.style.text.line_height_in_pixels(window.rem_size());
@@ -8609,7 +8609,8 @@ impl Element for EditorElement {
                         EditorMode::SingleLine
                             | EditorMode::AutoHeight { .. }
                             | EditorMode::Full {
-                                sized_by_content: true,
+                                sizing_behavior: SizingBehavior::ExcludeOverscrollMargin
+                                    | SizingBehavior::SizeByContent,
                                 ..
                             }
                     ) {