Rename h_stack and v_stack to h_flex and v_flex, respectively (#4053)

This PR renames the `h_stack` and `v_stack` to `h_flex` and `v_flex`,
respectively.

We were previously using `h_stack` and `v_stack` to match SwiftUI, but
`h_flex` and `v_flex` fit better with the web/flexbox terminology that
the rest of GPUI uses.

Additionally, we were already calling the utility functions used to
implement `h_stack` and `v_stack` by the new names.

Release Notes:

- N/A

crates/editor/src/editor.rs

@@ -99,8 +99,8 @@ use sum_tree::TreeMap;
 use text::{OffsetUtf16, Rope};
 use theme::{ActiveTheme, PlayerColor, StatusColors, SyntaxTheme, ThemeColors, ThemeSettings};
 use ui::{
-    h_stack, prelude::*, ButtonSize, ButtonStyle, IconButton, IconName, IconSize, ListItem,
-    Popover, Tooltip,
+    h_flex, prelude::*, ButtonSize, ButtonStyle, IconButton, IconName, IconSize, ListItem, Popover,
+    Tooltip,
 };
 use util::{post_inc, RangeExt, ResultExt, TryFutureExt};
 use workspace::{searchable::SearchEvent, ItemNavHistory, Pane, SplitDirection, ViewId, Workspace};
@@ -1264,7 +1264,7 @@ impl CompletionsMenu {
                                     None
                                 } else {
                                     Some(
-                                        h_stack().ml_4().child(
+                                        h_flex().ml_4().child(
                                             Label::new(text.clone())
                                                 .size(LabelSize::Small)
                                                 .color(Color::Muted),
@@ -1290,7 +1290,7 @@ impl CompletionsMenu {
                                         )
                                         .map(|task| task.detach_and_log_err(cx));
                                 }))
-                                .child(h_stack().overflow_hidden().child(completion_label))
+                                .child(h_flex().overflow_hidden().child(completion_label))
                                 .end_slot::<Div>(documentation_label),
                         )
                     })
@@ -9747,7 +9747,7 @@ pub fn diagnostic_block_renderer(diagnostic: Diagnostic, _is_valid: bool) -> Ren
         let group_id: SharedString = cx.block_id.to_string().into();
         // TODO: Nate: We should tint the background of the block with the severity color
         // We need to extend the theme before we can do this
-        h_stack()
+        h_flex()
             .id(cx.block_id)
             .group(group_id.clone())
             .relative()

crates/editor/src/element.rs

@@ -53,7 +53,7 @@ use std::{
 use sum_tree::Bias;
 use theme::{ActiveTheme, PlayerColor};
 use ui::prelude::*;
-use ui::{h_stack, ButtonLike, ButtonStyle, IconButton, Tooltip};
+use ui::{h_flex, ButtonLike, ButtonStyle, IconButton, Tooltip};
 use util::ResultExt;
 use workspace::item::Item;
 
@@ -2293,7 +2293,7 @@ impl EditorElement {
                             .size_full()
                             .p_1p5()
                             .child(
-                                h_stack()
+                                h_flex()
                                     .id("path header block")
                                     .py_1p5()
                                     .pl_3()
@@ -2306,8 +2306,8 @@ impl EditorElement {
                                     .justify_between()
                                     .hover(|style| style.bg(cx.theme().colors().element_hover))
                                     .child(
-                                        h_stack().gap_3().child(
-                                            h_stack()
+                                        h_flex().gap_3().child(
+                                            h_flex()
                                                 .gap_2()
                                                 .child(
                                                     filename
@@ -2339,12 +2339,12 @@ impl EditorElement {
                                     }),
                             )
                     } else {
-                        h_stack()
+                        h_flex()
                             .id(("collapsed context", block_id))
                             .size_full()
                             .gap(gutter_padding)
                             .child(
-                                h_stack()
+                                h_flex()
                                     .justify_end()
                                     .flex_none()
                                     .w(gutter_width - gutter_padding)

crates/editor/src/items.rs

@@ -32,7 +32,7 @@ use std::{
 };
 use text::Selection;
 use theme::Theme;
-use ui::{h_stack, prelude::*, Label};
+use ui::{h_flex, prelude::*, Label};
 use util::{paths::PathExt, paths::FILE_ROW_COLUMN_DELIMITER, ResultExt, TryFutureExt};
 use workspace::{
     item::{BreadcrumbText, FollowEvent, FollowableItemHandle},
@@ -619,7 +619,7 @@ impl Item for Editor {
             Some(util::truncate_and_trailoff(&description, MAX_TAB_TITLE_LEN))
         });
 
-        h_stack()
+        h_flex()
             .gap_2()
             .child(Label::new(self.title(cx).to_string()).color(label_color))
             .when_some(description, |this, description| {