Fix blanklines at start

butterfly/static/main.js

@@ -261,7 +261,7 @@
       i = this.rows;
       this.shift = 0;
       while (i--) {
-        this.screen.push(this.blankLine());
+        this.screen.push(this.blankLine(false, false));
       }
       this.setupStops();
       return this.skipNextKey = null;
@@ -770,6 +770,7 @@
               case "\n":
               case "\x0b":
               case "\x0c":
+                this.screen[this.y + this.shift].dirty = true;
                 this.nextLine();
                 break;
               case "\r":
@@ -1731,8 +1732,14 @@
       return this.eraseRight(0, y);
     };
 
-    Terminal.prototype.blankLine = function(cur) {
+    Terminal.prototype.blankLine = function(cur, dirty) {
       var attr, i, line;
+      if (cur == null) {
+        cur = false;
+      }
+      if (dirty == null) {
+        dirty = true;
+      }
       attr = (cur ? this.eraseAttr() : this.defAttr);
       line = [];
       i = 0;
@@ -1742,7 +1749,7 @@
       }
       return {
         chars: line,
-        dirty: false,
+        dirty: dirty,
         wrap: false
       };
     };

coffees/term.coffee

@@ -169,7 +169,7 @@ class Terminal
     @screen = []
     i = @rows
     @shift = 0
-    @screen.push @blankLine() while i--
+    @screen.push @blankLine(false, false) while i--
     @setupStops()
     @skipNextKey = null
 
@@ -600,6 +600,7 @@ class Terminal
             # '\n', '\v', '\f'
             when "\n", "\x0b", "\x0c"
               # @x = 0 if @convertEol
+              @screen[@y + @shift].dirty = true
               @nextLine()
 
             # '\r'
@@ -1585,7 +1586,7 @@ class Terminal
   eraseLine: (y) ->
     @eraseRight 0, y
 
-  blankLine: (cur) ->
+  blankLine: (cur=false, dirty=true) ->
     attr = (if cur then @eraseAttr() else @defAttr)
     line = []
     i = 0
@@ -1594,7 +1595,7 @@ class Terminal
       i++
 
     chars: line
-    dirty: false
+    dirty: dirty
     wrap: false
 
   ch: (cur) ->