Convert max height topic banner configuration to max lines.

config.yaml

@@ -92,9 +92,10 @@ buffer:
   #            Topic changes will still show up as a server
   #            message in channel.
   topic: !Banner
-    # Maximum height of the topic banner, when topic is set to !Banner.
-    # - Default is 42
-    max_height: 42
+    # Maximum visible lines of the topic banner before scrolling, when
+    # topic is set to !Banner.
+    # - Default is 2
+    max_lines: 2
 
   # Control different server messages.
   # - exclude [All, None, !Smart seconds]:

data/src/buffer.rs

@@ -71,13 +71,13 @@ pub enum Topic {
     #[default]
     Inline,
     Banner {
-        #[serde(default = "default_topic_banner_max_height")]
-        max_height: u16,
+        #[serde(default = "default_topic_banner_max_lines")]
+        max_lines: u16,
     },
 }
 
-fn default_topic_banner_max_height() -> u16 {
-    42
+fn default_topic_banner_max_lines() -> u16 {
+    2
 }
 
 #[derive(Debug, Clone, Deserialize)]

src/buffer/banner_view.rs

@@ -47,7 +47,7 @@ pub fn view<'a>(
     let content = column![column(messages)];
 
     Some(
-        scrollable(container(content).width(Length::Fill).padding([4, 8]))
+        scrollable(container(content).width(Length::Fill).padding(padding()))
             .style(theme::Scrollable::Banner)
             .direction(scrollable::Direction::Vertical(
                 scrollable::Properties::default()
@@ -60,6 +60,10 @@ pub fn view<'a>(
     )
 }
 
+pub fn padding() -> [u16; 2] {
+    [4, 8]
+}
+
 pub fn style_topic_who_time<'a>(
     who: &str,
     time: DateTime<Utc>,

src/buffer/channel.rs

@@ -7,7 +7,7 @@ use iced::{Command, Length};
 
 use super::{banner_view, input_view, scroll_view, user_context};
 use crate::theme;
-use crate::widget::{selectable_text, Collection, Element};
+use crate::widget::{double_pass, selectable_text, Collection, Element};
 
 #[derive(Debug, Clone)]
 pub enum Message {
@@ -120,10 +120,7 @@ pub fn view<'a>(
         data::buffer::InputVisibility::Always => status.connected(),
     };
 
-    let topic_banner = if let Topic::Banner {
-        max_height: topic_banner_max_height,
-    } = config.buffer.topic
-    {
+    let topic_banner = if let Topic::Banner { max_lines } = config.buffer.topic {
         banner_view::view(
             &state.banner_view,
             banner_view::Kind::ChannelTopic(&state.server, &state.channel),
@@ -169,10 +166,18 @@ pub fn view<'a>(
             },
         )
         .map(|banner| {
-            column![container(banner.map(Message::BannerView))
-                .style(theme::Container::Banner)
-                .max_height(topic_banner_max_height)]
-            .width(Length::Fill)
+            let mut layout_column = column![];
+            for _ in 0..max_lines {
+                layout_column = layout_column.push(row![].push(selectable_text(" ")));
+            }
+
+            double_pass(
+                container(layout_column)
+                    .width(Length::Fill)
+                    .padding(banner_view::padding()),
+                column![container(banner.map(Message::BannerView)).style(theme::Container::Banner)]
+                    .width(Length::Fill),
+            )
         })
     } else {
         None