feat: config for floating preview window (#74)

lua/oil/config.lua

@@ -74,6 +74,29 @@ local default_config = {
       winblend = 10,
     },
   },
+  -- Configuration for the actions floating preview window
+  preview = {
+    -- Width dimensions can be integers or a float between 0 and 1 (e.g. 0.4 for 40%)
+    -- min_width and max_width can be a single value or a list of mixed integer/float types.
+    -- max_width = {100, 0.8} means "the lesser of 100 columns or 80% of total"
+    max_width = 0.9,
+    -- min_width = {40, 0.4} means "the greater of 40 columns or 40% of total"
+    min_width = { 40, 0.4 },
+    -- optionally define an integer/float for the exact width of the preview window
+    width = nil,
+    -- Height dimensions can be integers or a float between 0 and 1 (e.g. 0.4 for 40%)
+    -- min_height and max_height can be a single value or a list of mixed integer/float types.
+    -- max_height = {80, 0.9} means "the lesser of 80 columns or 90% of total"
+    max_height = 0.9,
+    -- min_height = {5, 0.1} means "the greater of 5 columns or 10% of total"
+    min_height = { 5, 0.1 },
+    -- optionally define an integer/float for the exact height of the preview window
+    height = nil,
+    border = "rounded",
+    win_options = {
+      winblend = 0,
+    },
+  },
 }
 
 -- The adapter API hasn't really stabilized yet. We're not ready to advertise or encourage people to