config: add window-padding-color=extend-always to force always

src/config/Config.zig

@@ -701,6 +701,8 @@ keybind: Keybinds = .{},
 ///
 /// * `background` - The background color specified in `background`.
 /// * `extend` - Extend the background color of the nearest grid cell.
+/// * `extend-always` - Same as "extend" but always extends without applying
+///   any of the heuristics that disable extending noted below.
 ///
 /// The "extend" value will be disabled in certain scenarios. On primary
 /// screen applications (i.e. not something like Neovim), the color will not
@@ -2729,6 +2731,7 @@ pub const OptionAsAlt = enum {
 pub const WindowPaddingColor = enum {
     background,
     extend,
+    @"extend-always",
 };
 
 /// Color represents a color using RGB.

src/renderer/Metal.zig

@@ -1964,7 +1964,14 @@ pub fn setScreenSize(
             padding_extend.right = true;
         },
 
-        else => {
+        .@"extend-always" => {
+            padding_extend.up = true;
+            padding_extend.down = true;
+            padding_extend.left = true;
+            padding_extend.right = true;
+        },
+
+        .background => {
             // Otherwise, disable all padding extension.
             padding_extend = .{};
         },
@@ -2146,10 +2153,20 @@ fn rebuildCells(
         // We also reset our padding extension depending on the screen type
         switch (self.config.padding_color) {
             .background => {},
+
             .extend => {
                 self.uniforms.padding_extend.up = screen_type == .alternate;
                 self.uniforms.padding_extend.down = screen_type == .alternate;
             },
+
+            .@"extend-always" => {
+                self.uniforms.padding_extend = .{
+                    .up = true,
+                    .down = true,
+                    .left = true,
+                    .right = true,
+                };
+            },
         }
     }
 
@@ -2187,12 +2204,16 @@ fn rebuildCells(
         // under certain conditions we feel are safe. This helps make some
         // scenarios look better while avoiding scenarios we know do NOT look
         // good.
-        if (self.config.padding_color == .extend) {
+        switch (self.config.padding_color) {
-            if (y == 0 and screen_type == .primary) {
+            // These already have the correct values set above.
+            .background, .@"extend-always" => {},
+
+            // Apply heuristics for padding extension.
+            .extend => if (y == 0 and screen_type == .primary) {
                 self.uniforms.padding_extend.up = !row.neverExtendBg();
             } else if (y == self.cells.size.rows - 1 and screen_type == .primary) {
                 self.uniforms.padding_extend.down = !row.neverExtendBg();
-            }
+            },
         }
 
         // Split our row into runs and shape each one.

src/renderer/OpenGL.zig

@@ -169,7 +169,7 @@ const SetScreenSize = struct {
             // clear color.
             .background => .{},
 
-            .extend => self.size.blankPadding(padding, grid_size, .{
+            .extend, .@"extend-always" => self.size.blankPadding(padding, grid_size, .{
                 .width = r.grid_metrics.cell_width,
                 .height = r.grid_metrics.cell_height,
             }).add(padding),
@@ -1213,9 +1213,19 @@ pub fn rebuildCells(
     var cursor_cell: ?CellProgram.Cell = null;
 
     if (rebuild) {
-        // We also reset our padding extension depending on the screen type
+        switch (self.config.padding_color) {
-        self.padding_extend_top = screen_type == .alternate;
+            .background => {},
-        self.padding_extend_bottom = screen_type == .alternate;
+
+            .extend => {
+                self.padding_extend_top = screen_type == .alternate;
+                self.padding_extend_bottom = screen_type == .alternate;
+            },
+
+            .@"extend-always" => {
+                self.padding_extend_top = true;
+                self.padding_extend_bottom = true;
+            },
+        }
     }
 
     // Build each cell
@@ -1268,10 +1278,16 @@ pub fn rebuildCells(
         // under certain conditions we feel are safe. This helps make some
         // scenarios look better while avoiding scenarios we know do NOT look
         // good.
-        if (y == 0 and screen_type == .primary) {
+        switch (self.config.padding_color) {
-            self.padding_extend_top = !row.neverExtendBg();
+            // These already have the correct values set above.
-        } else if (y == self.grid_size.rows - 1 and screen_type == .primary) {
+            .background, .@"extend-always" => {},
-            self.padding_extend_bottom = !row.neverExtendBg();
+
+            // Apply heuristics for padding extension.
+            .extend => if (y == 0 and screen_type == .primary) {
+                self.padding_extend_top = !row.neverExtendBg();
+            } else if (y == self.grid_size.rows - 1 and screen_type == .primary) {
+                self.padding_extend_bottom = !row.neverExtendBg();
+            },
         }
 
         // Split our row into runs and shape each one.